The Grand Seiko 4520-7010 (ref. 45GS 040) is a Hi-Beat manual wind watch of the 45GS family. Although there is only one version of this reference presented in the Seiko JDM catalogs, there is a relatively common variant of the dial, without 36000 written under Hi-Beat.
The first appearance in the official Seiko catalogs is in the second volume of 1970, while the last appearance is in the second volume of 1971.
There is a date version of this watch, with reference 4522-7010 (45GSC 040).
Stainless Steel
| Ref. | 45GS 040 |
| Case-movement ref. | 4520-7010 |
| Year | 1970 |
| Caliber | 4520A |
| Jewels | 25 |
| Bph | 36,000 |
| Type | Hi-Beat Manual Wind |
| Family | 45GS |
| Branch | Daini Seikosha |
| Material | Stainless Steel |
| Crystal | Hardlex |
| Size | Diameter: 36.5 mm Lug width: 18 mm |
| Complications | – |
| Hacking | Yes |
| Dial code | JAPAN 4520-7010T |
| Technical info | Japanese |
| Catalogs | 1970 vol. 2 1971 vol. 1 1971 vol. 2 |