Grand Seiko 45GS complete guide

Grand Seiko 45GS

The 45GS is a family of hi-beat manually wound watches, produced by Daini Seikosha between 1968 and the early 1970s.

There is a total of three movements in the 45GS family:

  • 4520A – time only
  • 4522A – date
  • 4580A – time only V.F.A. (Very Fine Adjusted)

The 4580A V.F.A. was one of the world’s most accurate mechanical movements at the time.

45GS Time Only

This series of watches was based on the caliber 4520A.

4520-8000

Ref. 4520-8000 (45GS 010)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4520-8000 (45GS 010)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: gold cap

Ref. 4520-7000 (45GS 020)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4520-7000 (45GS 020)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: gold cap

Ref. 4520-7000 (45GS 021)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4520-8010 (45GS 030)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: 18k gold

Ref. 4520-7010 (45GS 040)

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4520-7020

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Imperial Grand Seiko.

Produced on commission for the Imperial House of Japan, according to some testimonies these watches were given to diplomats and politicians as souvenirs, delivered by the Emperor himself during some of his institutional visits abroad.

Ref. 4520-8020 (45GSN 016)*

Movement: 4520
Type: manual
Jewels: 25
Bph: 36.000
Case: 18k gold

*Seiko branded watch, but with movement from the 45GS family and GS in the ref.

45GS Date

This series of watches was based on the caliber 4522A.

Ref. 4522-8000 (45GSC 010)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4522-8000 (45GSC 010)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: gold cap

Ref. 4522-7000 (45GSC 020)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4522-7000 (45GSC 020)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: gold cap

Ref. 4522-7000 (45GSC 021)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4522-8010 (45GSC 030)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: 18k gold

Ref. 4522-7010 (45GSC 040)

Movement: 4522
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

45GS Very Fine Adjusted

This series of watches was based on the caliber 4580A.

Ref. 4580-7000 (4580 014)

Movement: 4580
Type: manual
Jewels: 25
Bph: 36.000
Case: hardened stainless steel

Ref. 4580-7010 (4580 020)

Movement: 4580
Type: manual
Jewels: 25
Bph: 36.000
Case: stainless steel

Ref. 4580-7020

Movement: 4580
Type: manual
Jewels: 25
Bph: 36.000

Imperial V.F.A.

Produced on commission for the Imperial House of Japan, according to some testimonies these watches were given to diplomats and politicians as souvenirs, delivered by the Emperor himself during some of his institutional visits abroad.

MovementTypeJewelsBphComplicationsTechnical information
4520AManual2536.000Japanese
4522AManual2536.000DateJapanese
4580AManual2536.000