| Model | Grand Seiko 44GS 4420-9990 |
| Reference | 4420-9990 |
| Year of Production | 1967 |
| Movement | Manual winding (Cal.4420B) |
| Country of Origin | Japan |
| Water Resistance | non-waterproof |
| Case Diameter | 36mm |
| Case Material | Stainless steel |
| Crystal | plastic |
| Lug Width | 18mm |
| Buckle Width | 15mm |