Seiko Monster: guide to all the watches

Seiko Monster Blue Coral

Appearing for the first time in Japan in 2000, with the references SKX779 (black dial) and SKX781 (orange dial), these diving watches with a “grotesque” appearance immediately divided enthusiasts.

Renamed Seiko Monster because of their design, they are loved by some and hated by others, and over the years they have been able to attract the attention of many collectors.

In this guide we will see all the models released from the beginning to today (updated in December 2020).

First generation

The two iconic black and orange Monsters of the first generation housed the 7S26 automatic caliber, the same present in the famous SKX007 and SKX009. This movement, used in many Seiko entry-levels starting from the second half of the 90s, was affordable but robust, and characterized by the absence of manual winding and hacking.

Certified for diving up to 200 meters, the Black and Orange Monster were sold at affordable prices, around 250 USD.

A characteristic feature of the first generation, which will subsequently be lost, are the seconds written alongside the indices on the dial.

Classic Black Monster

Ref: SKX779 (7S26-0350)
Caliber: 7S26
Year: 2000

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Classic Orange Monster

Ref: SKX781 (7S26-0350)
Caliber: 7S26
Year: 2000

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Black Monster (North America)

Ref: SKXA43 (7S26-0351)
Caliber: 7S26

42mm stainless steel case, Hardlex crystal, screw-down crown, 21 jewels, 41 hour power reserve, 21,600 bph.

Orange Monster (North America)

Ref: SKXA45 – SKXA37 (7S26-0351)
Caliber: 7S26
Year: 2002

42mm stainless steel case, Hardlex crystal, screw-down crown, 21 jewels, 41 hour power reserve, 21,600 bph.

Limited Editions of the first generation

After the first models, Seiko presented Limited Editions in various colors, dedicated almost exclusively to the Asian market, and in particular to Thailand, a country where the Monsters apparently enjoyed great success.

As a movement we find the 7S36, which is very similar to the previous 7S26 but with the addition of two jewels.

These brightly colored editions, produced in limited numbers, have become a cult object for some collectors, and are occasionally sold at auction at much higher prices than they were on retail (even more than 10 times higher).

Yellow Monster

Ref: SKZ203 (7S36-01B0)
Caliber: 7S36
Limited edition of 300 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 23 jewels, 41 hours of power reserve, 21,600 bph.

Blue Monster

Ref: SKZ213 (7S36-01G0)
Caliber: 7S36
Limited edition of 1800 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 23 jewels, 41 hours of power reserve, 21,600 bph.

Red Monster

Ref: SKZ243 (7S36-01B0)
Caliber: 7S36
Limited edition of 1313 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 23 jewels, 41 hours of power reserve, 21,600 bph.

Green Monster

Ref: SKZ277 (7S36-03W0)
Caliber: 7S36
Limited edition of 1881 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 23 jewels, 41 hours of power reserve, 21,600 bph.

Snow Monster

Ref: SKZ331 (7S36-05D0)
Caliber: 7S36
Limited edition of 2555 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 23 jewels, 41 hours of power reserve, 21,600 bph.

Night Monsters

In 2007, Seiko introduced another series of first generation Monsters to Japan, featuring a black case and bracelet.

Orange Night Monster

Ref: SZEN001 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Black Night Monster

Ref: SZEN002 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

White Night Monster

Ref: SZEN006 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Purple Night Monster

Ref: SZEN007 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Night Monster SZEN007

Ref: SZEN009 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Night Monster SZEN010

Ref: SZEN010 (7S26-03G0)
Caliber: 7S26

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 21 jewels, 41 hours of power reserve, 21,600 bph.

Second generation

In 2012 the second generation of Seiko Monster enters the scene, introducing two main innovations: the caliber 4R36 with hacking and the possibility of manual winding, and new indexes that resemble long pointed teeth.

The latest models of the second generation see the appearance of the Prospex X on the dial, which later will always be present on all models of subsequent generations.

Black Monster 2nd Gen.

Ref: SRP307 (4R36-01J0)
Caliber: 4R36
Year: 2012

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Orange Monster 2nd Gen.

Ref: SRP309 (4R36-01J0)
Caliber: 4R36
Year: 2012

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Monster Halloween

Ref: SRP311 (4R36-01J0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Monster Dracula

Ref: SRP313 (4R36-01J0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Orange/Black Monster 2nd Gen.

Ref: SRP315 (4R36-01J0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Sea Monster

Ref: SRP581 (4R36-01J0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Black Ion Monster

Ref: SRP583 (4R36-01J0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Limited Editions of the second generation

Even with the second generation, Seiko has released several Limited Editions for the Thai and Asian market, particularly sought after by collectors.

Among these editions stands out the Zamba Monster, which has a crown and indices reminiscent of the first generation.

Zamba Monster

Ref: SRP319 (4R36-01W0)
Caliber: 4R36
Year: 2012
Limited edition of 2112 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Power Blue Monster

Ref: SRP455 (4R36-02B0)
Caliber: 4R36
Year: 2013
Limited edition of 1000 pieces.

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Moon Monster

Ref: SRP457 (4R36-03B0)
Caliber: 4R36
Year: 2013
Limited edition of 1313 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Sun Monster

Ref: SRP459 (4R36-02A0)
Caliber: 4R36
Year: 2013
Limited edition of 2323 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Super Power Blue Monster

Ref: SRP461 (4R36-02P0)
Caliber: 4R36
Limited edition of 500 pieces.

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Royal Blue Monster

Ref: SRP657 (4R36-03Y0)
Caliber: 4R36
Limited edition of 1750 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Third generation

The third generation of Seiko Monsters make their debut in 2014, introducing the 6R15 automatic movement, with a power reserve of 50 hours, hacking and manual winding.

Orange Monster 3rd Gen.

Ref: SBDC023 (6R15-02X0)
Caliber: 6R15
Year: 2014

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Black Monster 3rd Gen.

Ref: SBDC025 (6R15-02X0)
Caliber: 6R15
Year: 2014

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Blue Coral Monster

Ref: SBDC067 (6R15-02X0)
Caliber: 6R15

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Ice Monster

Ref: SBDC073 (6R15-02X0)
Caliber: 6R15

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Orange Sunburst Monster

Ref: SBDC075 (6R15-02X0)
Caliber: 6R15

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Blue Monster 3rd Gen.

Ref: SZSC003 (6R15-02X0)
Caliber: 6R15

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Jade Monster

Ref: SZSC005 (6R15-02X0)
Caliber: 6R15

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 23 jewels, 50 hours of power reserve, 21,600 bph, manual winding, hacking.

Fourth generation

The latest to date is the fourth generation, which for the first time sees a downgrade of the movement compared to the previous series. In fact, from the 6R15 we’re back to the 4R36, the same caliber of the second generation.

Blue Monster 4th Gen.

Ref: SBDY033 (4R36-07N0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Black Monster 4th Gen.

Ref: SBDY035 (4R36-07N0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Blacker Monster 4th Gen.

Ref: SBDY037 (4R36-07N0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Monster Save The Ocean

Ref: SBDY045 (4R36-08C0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Monster PADI

Ref: SBDY057 (4R36-07N0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Tubbataha Reef Monster

Ref: SRPF33 (4R36-09C0)
Caliber: 4R36
Limited edition of 1000 pieces.

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Komodo Dragon Zimbe Monster

Ref: SRPF34 (4R36-09B0)
Caliber: 4R36
Limited edition of 1500 pieces.

Stainless steel case 42mm, sapphire crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Yellow Monster 4th Gen.

Ref: SRPF35 (4R36-08B0)
Caliber: 4R36

Stainless steel case 42mm, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Monster STO Antarctica

Ref: SRPG57 (4R36-11C0)
Caliber: 4R36

42mm stainless steel case, Hardlex crystal, screw-down crown, 24 jewels, 40 hours of power reserve, 21,600 bph, manual winding, hacking.

Summary of the models

First generation

NicknameRefOther Ref.MC Ref.CaliberLimited
Black MonsterSKX779SKX779J1, SKX779J, SKX779K1, SKX779K2, SKX779K7S26-03507S26No
Orange MonsterSKX781SKX781J1, SKX781J, SKX781K1, SKX781K2, SKX781K7S26-03507S26No
Black Monster (North America)SKXA43SKXA43K7S26-03517S26No
Orange Monster (North America)SKXA45SKXA37, SKXA45K, SKXA37K7S26-03517S26No
Yellow MonsterSKZ203SKZ203K1, SKZ203K7S36-01B07S36Yes (300)
Blue MonsterSKZ213SKZ213K1, SKZ213K7S36-01G07S36Yes (1800)
Red MonsterSKZ243SKZ243K1, SKZ243K2, SKZ243K7S36-01B07S36Yes (1313)
Green MonsterSKZ277SKZ277K1, SKZ277K7S36-03W07S36Yes (1881)
Snow MonsterSKZ331SKZ331K1, SKZ331K7S36-05D07S36Yes (2555)

Night Monsters

NicknameRefMC Ref.CaliberLimited
Orange Night MonsterSZEN0017S26-03G07S26No
Night MonsterSZEN0027S26-03G07S26No
White Night MonsterSZEN0067S26-03G07S26No
Purple Night MonsterSZEN0077S26-03G07S26No
Night Monster SZEN009SZEN0097S26-03G07S26No
Night Monster SZEN010SZEN0107S26-03G07S26No

Second generation

NicknameRefOther Ref.MC Ref.CaliberLimited
Black Monster 2nd Gen.SRP307SRP307J1, SRP307J2, SRP307J, SRP307K1, SRP307K2, SRP307K4R36-01J04R36No
Orange Monster 2nd Gen.SRP309SRP309J1, SRP309J2, SRP309J, SRP309K1, SRP309K2, SRP309K4R36-01J04R36No
Monster HalloweenSRP311SRP311J1, SRP311J2, SRP311J, SRP311K1, SRP311K2, SRP311K4R36-01J04R36No
Monster DraculaSRP313SRP313J1, SRP313J2, SRP313J, SRP313K1, SRP313K2, SRP313K4R36-01J04R36No
Orange/Black MonsterSRP315SRP315J1, SRP315J2, SRP315J, SRP315K1, SRP315K2, SRP315K4R36-01J04R36No
Sea MonsterSRP581SRP581J1, SRP581J, SRP581K1, SRP581K4R36-01J04R36No
Black Ion MonsterSRP583SRP583J1, SRP583J, SRP583K1, SRP583K2, SRP583K4R36-01J04R36No
Zamba MonsterSRP319SRP319K1, SRP319K4R36-01W04R36Yes (2112)
Power Blue MonsterSRP455SRP455J1, SRP455J, SRP455K1, SRP455K4R36-02B04R36Yes (1000)
Moon MonsterSRP457SRP457K1, SRP457K4R36-03B04R36Yes (1313)
Sun MonsterSRP459SRP459K1, SRP459K4R36-02G04R36Yes (2323)
Super Power Blue MonsterSRP461SRP461K1, SRP461K4R36-02P04R36Yes (500)
Royal Blue MonsterSRP657SRP657K1, SRP657K4R36-03Y04R36Yes (1750)

Third generation

NicknameRefMC Ref.CaliberLimited
Orange Monster 3rd Gen.SBDC0236R15-02X06R15No
Black Monster 3rd Gen.SBDC0256R15-02X06R15No
Blue Coral MonsterSBDC0676R15-02X06R15No
Ice MonsterSBDC0736R15-02X06R15No
Orange Sunburst MonsterSBDC0756R15-02X06R15No
Blue Monster 3rd Gen.SZSC0036R15-02X06R15No
Jade MonsterSZSC0056R15-02X06R15No

Fourth generation

NicknameRefOther Ref.MC Ref.CaliberLimited
Blue Monster 4th Gen.SBDY033SRPD25K1, SRPD25K, SRPD254R36-07N0; 4R36-07B04R36No
Black Monster 4th Gen.SBDY035SRPD27K1, SRPD27K, SRPD274R36-07N0; 4R36-07B04R36No
Blacker Monster 4th Gen.SBDY037SRPD29K1, SRPD29K, SRPD29J1, SRPD29J, SRPD294R36-07N0; 4R36-07B04R36No
Monster Save The OceanSBDY045SRPE09K1, SRPE09K, SRPE09J1, SRPE09J, SRPE094R36-08C0;
4R36-07B0
4R36No
Monster PADISBDY057SRPE27K1, SRPE27K, SRPE27J1, SRPE27J, SRPE274R36-07N0; 4R36-07B04R36No
Tubbataha Reef MonsterSRPF33SRPF33K1, SRPF33K4R36-08C04R36Yes (1000)
Komodo Dragon Zimbe MonsterSRPF34SRPF34K1, SRPF34K4R36-09B04R36Yes (1500)
Yellow Monster 4th Gen.SRPF35SRPF35K1, SRPF35K4R36-08B04R36No
Monster STO AntarcticaSRPG57SRPG57K1, SRPG57K4R36-11C04R36No

The origins: Quartz Monsters

The first Seiko watches to have a “Monster-like design” are two quartz watches, ref. SLR001 and SLR003, which were equipped with the 8F35 movement with perpetual calendar.
These two watches can be considered the grandparents of the series.

NicknameRefMC Ref.CaliberLimited
Black Quartz MonsterSLR0018F35-00198F35No
Peach Quartz MonsterSLR0038F35-00108F35No

Series with similarities

Over the years, Seiko has introduced several series which, while not considered true Monsters, have several things in common.

Land Monsters

Seiko Land Monsters
NicknameRefOther Ref.MC Ref.CaliberLimited
Black Land MonsterSNM0357S35-00F07S35No
Orange Land MonsterSNM0377S35-00F07S35No
Prince MonsterSNM039SNM039K1, SNM039K7S35-00G07S35Yes (1666)

Frankenmonsters (Seiko 5)

Frankenmonsters
NicknameRefOther Ref.MC Ref.CaliberLimited
Blue FrankenmonsterSKZ245SKZ245J1, SKZ245J, SKZ245K1, SKZ245K7S36-02S07S36No
Black FrankenmonsterSKZ247SKZ247J1, SKZ247J, SKZ247K1, SKZ247K7S36-02S07S36No
Orange FrankenmonsterSKZ249SKZ249J1, SKZ249J, SKZ249K1, SKZ249K7S36-02S07S36No
Yellow FrankenmonsterSKZ251SKZ251J1, SKZ251J2, SKZ251J, SKZ251K1, SKZ251K2, SKZ251K7S36-02S07S36No
Frankenmonster SKZ253SKZ253SKZ253J1, SKZ253J, SKZ253K1, SKZ253K7S36-02S07S36No
Frankenmonster SKZ255SKZ255SKZ255J1, SKZ255J2, SKZ255J, SKZ255K1, SKZ255K2, SKZ255K7S36-02S07S36No

Trek Monsters

NicknameRefMC Ref.CaliberLimited
Trek MonsterSARB0476R15-01F06R15No
Trek MonsterSARB0486R15-01G06R15No
Trek MonsterSARB0496R15-01H06R15No
Trek MonsterSARB053?6R15Yes
Trek MonsterSARB0556R15-01H06R15Yes
Trek MonsterSARB057?6R15Yes
Trek MonsterSARB075?6R15Yes (750)
Trek MonsterSARB077?6R15Yes (750)
Trek MonsterSARB078?6R15Yes (900)

Mini Trek Monster (Seiko 5)

Ref: SRPB75
Other Ref: SRPB75K, SRPB75K1
MC Ref.: 4R36-06D0
Caliber: 4R36
Limited: Yes (1700)

Baby Monsters (Seiko 5)

NicknameRefOther Ref.MC Ref.CaliberLimited
White Baby MonsterSNZF45SNZF45J1, SNZF45J, SNZF45K1, SNZF45K7S36-03D07S36No
Black Baby MonsterSNZF47SNZF47J1, SNZF47J, SNZF47K1, SNZF47K7S36-03D07S36No
Orange Baby MonsterSNZF49SNZF49J1, SNZF49J, SNZF49K1, SNZF49K7S36-03D07S36No
Baby MonsterSNZF51SNZF51J1, SNZF51J, SNZF51K1, SNZF51K7S36-03D07S36No
Baby MonsterSNZF53SNZF53J1, SNZF53J, SNZF53K1, SNZF53K7S36-03D07S36No
Blue Baby MonsterSNZH47SNZH47K1, SNZH47K7S36-03X07S36Yes (999)
Burgundy Baby MonsterSNZH49SNZH49K1, SNZH49K7S36-03Y07S36Yes (1881)

Mini Monsters (Seiko 5)

NicknameRefOther Ref.MC Ref.CaliberLimited
Navy Blue Mini MonsterSRP379SRP379K1, SRP379K4R36-01K04R36Yes (499)
Snow Mini MonsterSRP481SRP481K1, SRP481K4R36-02T04R36No
Orange Mini MonsterSRP483SRP483K1, SRP483K, SRP483J1, SRP483J4R36-02T04R36No
Mini MonsterSRP485SRP485K1, SRP485K, SRP485J1, SRP485J4R36-02T04R36No
Mini MonsterSRP487SRP487K1, SRP487K4R36-02T04R36No
Mini MonsterSRP488SRP488K1, SRP488K4R36-02T04R36No
Mini MonsterSRP489SRP489K1, SRP489K4R36-02T04R36No
Mini MonsterSRP490SRP490K1, SRP490K4R36-02T04R36No
Green Mini MonsterSRP717SRP717K1, SRP717K4R36-04G04R36Yes (1500)

New Monsters (Seiko 5)

NicknameRefOther Ref.MC Ref.CaliberLimited
New MonsterSRP599SRP599J1, SRP599J, SRP599K1, SRP599K4R36-03T04R36No
New MonsterSRP601SRP601J1, SRP601J, SRP601K1, SRP601K4R36-03T04R36No
New MonsterSRP603SRP603J1, SRP603J2, SRP603J, SRP603K1, SRP603K2, SRP603K4R36-03T04R36No
New MonsterSRP605SRP605J1, SRP605J2, SRP605J, SRP605K1, SRP605K2, SRP605K4R36-03T04R36No
New MonsterSRP607SRP607J1, SRP607J, SRP607K1, SRP607K4R36-03T04R36No
New MonsterSRP608SRP608J1, SRP608J, SRP608K1, SRP608K4R36-03T04R36No

Baby Tuna/Monster Tuna

NicknameRefOther Ref.MC Ref.CaliberLimited
Baby TunaSRP227SRP227J1, SRP227J, SRP227K1, SRP227K4R36-00V04R36No
Baby TunaSRP229SRP229J1, SRP229J, SRP229K1, SRP229K?4R36No
Baby TunaSRP231SRP231J1, SRP231J, SRP231K1, SRP231K4R36-00V04R36No
Baby TunaSRP233SRP233J1, SRP233J, SRP233K1, SRP233K4R36-00T04R36Yes (1300)
Baby TunaSRP234SRP234J1, SRP234J, SRP234K1, SRP234K4R36-00T04R36Yes (1300)
Baby TunaSRP236SRP236J1, SRP236J, SRP236K1, SRP236K4R36-00T04R36Yes (1300)
Orange Baby TunaSRP251SRP251J1, SRP251J?4R36?
Superior Blue Baby TunaSRP453SRP453K1, SRP453K?4R36Yes (1300)
Baby TunaSRP637SRP637J1, SRP637J, SRP637K1, SRP637K2, SRP637K4R36-03Z04R36No
Baby TunaSRP639SRP639J1, SRP639J, SRP639K1, SRP639K2, SRP639K4R36-03Z04R36No
Baby TunaSRP641SRP641J1, SRP641J, SRP641K1, SRP641K4R36-03Z04R36No
Baby TunaSRP653SRP653J1, SRP653J, SRP653K1, SRP653K4R36-04D04R36No
Baby TunaSRP655SRP655J1, SRP655J, SRP655K1, SRP655K4R36-04D04R36No
Thailand Baby TunaSRP727SRP727K1, SRP727K4R36-04T04R36Yes (500)
Baby TunaSRPC96SRPC96K1, SRPC96K?4R36Yes (1234)
Rose Gold Brown Baby TunaSRPD14SRPD14K1, SRPD14K4R36-06X04R36Yes (2200)
Blue Butterfly Fish Baby TunaSRPD15SRPD15K1, SRPD15K4R36-07C04R36Yes (2200)
Baby TunaSRPE14SRPE14K1, SRPE14K4R36-08G04R36Yes (999)
Ice Frost Baby TunaSBDY053SBDY053J1, SBDY053J?4R36No
Baby Tuna Blue GradientSBDY055SBDY055J1, SBDY055J4R36-08F04R36No

Summary of watch movements

Main series

SeriesMovements
First generation7S26, 7S36
Second generation4R36
Third generation6R15
Fourth generation4R36

Other series

SeriesMovements
Land Monsters7S35
Frankenmonsters7S36
Trek Monsters6R15
Mini Trek Monster4R36
Baby Monsters7S36
Mini Monsters4R36
New Monsters4R36
Monster Tuna4R36

Caliber 7S26

Technical sheet

TypeAutomatic
Power reserve41 hours
Bph21,600
Jewels21
Lift Angle53°
Manual windingNo
HackingNo

Caliber 7S35

Technical sheet

TypeAutomatic
Power reserve41 hours
Bph21,600
Jewels23
Lift Angle53°
Manual windingNo
HackingNo

Caliber 7S36

Technical sheet

TypeAutomatic
Power reserve41 hours
Bph21,600
Jewels23
Lift Angle53°
Manual windingNo
HackingNo

Caliber 4R36

Technical sheet

TypeAutomatic
Power reserve40 hours
Bph21,600
Jewels24
Lift Angle53°
Manual windingYes
HackingYes

Caliber 6R15

Technical sheet

TypeAutomatic
Power reserve50 hours
Bph21,600
Jewels23
Lift Angle53°
Manual windingYes
HackingYes