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.
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.