The Grand Seiko 4520-7000 (ref. 45GS 020 and 45GS 021) is a Hi-Beat manual wind watch of the 45GS family. There are three versions of this reference, two in stainless steel, with a white textured dial or a dark blue dial, and one with a gold cap case, only available with a white textured dial.
The first appearance in the official Seiko catalogs is in the second volume of 1969, while the last appearance is in the second volume of 1971.
There is a date version of each of these three watches, with reference 4522-7000 (45GSC 020 and 45GSC 021).
Stainless Steel
Gold Cap
Stainless Steel
| Ref. | 45GS 020 (white textured dial) 45GS 021 (dark blue dial) |
| Case-movement ref. | 4520-7000 |
| Year | 1969 |
| Caliber | 4520A |
| Jewels | 25 |
| Bph | 36,000 |
| Type | Hi-Beat Manual Wind |
| Family | 45GS |
| Branch | Daini Seikosha |
| Material | Stainless Steel Gold Cap |
| Crystal | Hardlex |
| Size | Diameter: 37.5 mm Lug width: 18 mm |
| Complications | – |
| Hacking | Yes |
| Dial code | JAPAN 4520-7000T AD |
| Technical info | Japanese |
| Catalogs | 1969 vol. 2 1970 vol. 1 1970 vol. 2 1971 vol. 1 1971 vol. 2 |