Complete guide to the Seiko Sumo

Photo by Seiko

Introduced in 2007, the Sumo is one of Seiko’s youngest diving watches, and also one of the most loved by enthusiasts.

Three models were presented at launch: SBDC001 (black), SBDC003 (blue, also known as “Blumo”) and SBDC005 (orange). These were the first divers to house the 6R15 automatic caliber, produced entirely in-house, as usual for Seiko.

The name “Sumo”, chosen by enthusiasts and later adopted by Seiko itself, is due to various design aspects of the watch, which are discussed in this excellent article on Seiko-Design.com.

First generation

The first generation of Sumo was introduced in 2007 with three references, in black, blue and orange, housing the 6R15 automatic movement, produced in-house and equipped with manual winding and hacking functions.

The three main references are followed by limited editions in different colors. This generation will be the first and last without the X of Prospex on the dial.

Black Sumo

Ref: SBDC001 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Blue Sumo (Blumo)

Ref: SBDC003 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Orange Sumo

Ref: SBDC005 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Yellow Sumo

Ref: SBDC017 (6R15-02B0)
Movement: 6R15
Limited Edition of 750 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Green Sumo

Ref: SBDC019 (6R15-02E0)
Movement: 6R15
Limited Edition of 550 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Gray Sumo

Ref: SPB029 (6R15-02S0)
Movement: 6R15
Limited Edition of 1965 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Second generation

With the second generation, the Sumo becomes part of the Prospex line, and the famous X appears on the dial of the various models. The 6R15 movement remains unchanged, like all the relevant specs.

Black Sumo 2nd Gen.

Ref: SBDC031 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Blue Sumo (Blumo) 2nd Gen.

Ref: SBDC033 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

PADI Sumo

Ref: SBDC049 (6R15-03R0)
Movement: 6R15
Limited Edition of 1000 pieces.

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Pepsi Sumo

Ref: SBDC057 (6R15-04C0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Blue Coral

Ref: SBDC069 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Green

Ref: SZSC004 (6R15-00G0)
Movement: 6R15

45mm stainless steel case, Hardlex crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

50th Anniversary Sumo

Ref: SPB031 (6R15-03D0)
Movement: 6R15
Limited Edition of 820 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Thanos Zimbe Sumo

Ref: SPB055 (6R15-03X0)
Movement: 6R15
Limited Edition of 1639 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

The following watch stands out from the rest of the series because it is a cross between a Sumo and a 62MAS, hence the nickname “Sumas”. This is a limited edition of 2000 pieces, presented for the fiftieth anniversary of Seiko professional divers.

Sumas

Ref: SBDC027 (6R15-02T0)
Movement: 6R15
Limited Edition of 2000 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 23 jewels, 50 hour power reserve, 21,600 bph, manual winding, hacking function.

Third generation

With the third generation, several innovations are introduced. The movement is upgraded to the 6R35, with its 70 hours of power reserve, and the Hardlex crystal is replaced by sapphire on all models.

Black Sumo 3rd Gen.

Ref: SBDC083SPB101 (6R35-00A0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Green Sunburst Sumo (Hulk)

Ref: SBDC081SPB103 (6R35-00A0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Black Ninja

Ref: SBDC095SPB125 (6R35-00D0)
Movement: 6R35
Limited Edition of 7000 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Gray Sumo 3rd Gen.

Ref: SBDC097 (6R35-00M0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Deep Blue Sumo

Ref: SBDC099 (6R35-00M0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Thong Sia (Hawksbill Turtle)

Ref: SPB192 (6R35-00Y0)
Movement: 6R35
Limited Edition of 1200 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Zimbe No.15 Sumo

Ref: SPB194 (6R35-00Z0)
Movement: 6R35
Limited Edition of 1500 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Ion Green Sumo

Ref: SPB195 (6R35-01A0)
Movement: 6R35
Limited Edition of 500 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Japan Blue Sumo

Ref: SBDC113 (6R35-00G0)
Movement: 6R35
Limited Edition of 1000 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Ginza Limited

Ref: SBDC114 (6R35-00H0)
Movement: 6R35
Limited Edition of 700 pieces.

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

PADI Pepsi Sumo

Ref: SBDC121 (6R35-00R0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Ice Diver Gray

Ref: SPB175 (6R35-00S0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Ice Diver Green

Ref: SPB177 (6R35-00S0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Sumo Ice Diver Blue

Ref: SPB179 (6R35-00S0)
Movement: 6R35

45mm stainless steel case, sapphire crystal, screw-down crown, 24 jewels, 70 hour power reserve, 21,600 bph, manual winding, hacking function.

Summary of the models

First generation

NicknameRef.Other Ref.MC Ref.MovementLimited
Black SumoSBDC001SBDC001J, SBDC001J16R15-00G06R15No
Blue Sumo (Blumo)SBDC003SBDC003J, SBDC003J16R15-00G06R15No
Orange SumoSBDC005SBDC005J, SBDC005J16R15-00G06R15No
Yellow SumoSBDC0176R15-02B06R15Yes (750)
Green SumoSBDC0196R15-02E06R15Yes (550)
Gray SumoSPB029SPB029J, SPB029J16R15-02S06R15Yes (1965)

Second generation

NicknameRef.Other Ref.MC Ref.MovementLimited
Black Sumo 2nd Gen.SBDC031SBDC031J, SBDC031J16R15-00G06R15No
Blue Sumo (Blumo) 2nd Gen.SBDC033SBDC033J, SBDC033J16R15-00G06R15No
PADI SumoSBDC049SBDC049J, SBDC049J16R15-03R06R15Yes (1000)
Pepsi SumoSBDC057SBDC057J, SBDC057J16R15-04C06R15No
Sumo Blue CoralSBDC069SBDC069J, SBDC069J16R15-00G06R15No
Sumo GreenSZSC004SZSC004J, SZSC004J16R15-00G06R15No
50th Anniversary SumoSPB031SPB031J, SPB031J16R15-03D06R15Yes (820)
Thanos Zimbe SumoSPB055SPB055J, SPB055J16R15-03X06R15Yes (1639)
SumasSBDC027SBDC027J, SBDC027J16R15-02T06R15Yes (2000)

Third generation

NicknameRef.Other Ref.MC Ref.MovementLimited
Black Sumo 3rd Gen.SBDC083SPB101, SBDC083J, SBDC083J1, SPB101J, SPB101J16R35-00A06R35No
Sumo Green SunburstSBDC081SPB103, SBDC081J, SBDC081J1, SPB103J, SPB103J16R35-00A06R35No
Sumo Black NinjaSBDC095SPB125, SBDC095J, SBDC095J1, SPB125J, SPB125J16R35-00D06R35Yes (7000)
Gray Sumo 3rd Gen.SBDC097SBDC097J, SBDC097J16R35-00M06R35No
Deep Blue SumoSBDC099SBDC099J, SBDC099J16R35-00M06R35No
Sumo Thong YesaSPB192SPB192J, SPB192J16R35-00Y06R35Yes (1200)
Zimbe No.15 SumoSPB194SPB194J, SPB194J16R35-00Z06R35Yes (1500)
Ion Green SumoSPB195SPB195J, SPB195J16R35-01A06R35Yes (500)
Japan Blue SumoSBDC113SBDC113J, SBDC113J16R35-00G06R35Yes (1000)
Sumo Ginza LimitedSBDC114SBDC114J, SBDC114J16R35-00H06R35Yes (700)
PADI Pepsi SumoSBDC121SBDC121J, SBDC121J16R35-00R06R35No
Sumo Ice Diver GraySPB175SPB175J, SPB175J16R35-00S06R35No
Sumo Ice Diver GreenSPB177SPB177J, SPB177J16R35-00S06R35No
Sumo Ice Diver BlueSPB179SPB179J, SPB179J16R35-00S06R35No

Movements

SeriesMovements
First generation6R15
Second generation6R15
Third generation6R35

Movement 6R15

Technical sheet

TypeAutomatic
Power reserve50 hours
Bph21.600
Jewels23
Lift Angle53°
Manual windYes
HackingYes

Movement 6R35

TypeAutomatic
Power reserve70 hours
Bph21.600
Jewels24
Lift Angle53°
Manual windYes
HackingYes