| Model | GrandSeiko 45GS |
| Reference | 4520-8000 |
| Year of Production | September 1968 |
| Movement | Manual winding (Cal.4520A) |
| Country of Origin | Japan |
| Water Resistance | non-waterproof |
| Case Diameter | 35mm |
| Case Material | Stainless steel |
| Crystal | plastic |
| Lug Width | 18mm |
| Buckle Width | 15mm |