Compare Studio
44-9990 vs 45-7001
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| Specification | ||
|---|---|---|
| Nickname | 44KS | 45KS |
| Production | 1964–1968 | 1968–1972 |
| Era | 44KS — Daini manual-wind | 45KS — Daini high-beat manual |
| Status | discontinued | discontinued |
| Case diameter | 36.5mm | 36mm |
| Case material | Stainless steel | Stainless steel |
| Construction | Faceted case with sharp, flat-polished surfaces | — |
| Crystal | Acrylic | Acrylic |
| Crown | Push-pull crown at 3 | Push-pull crown at 3 |
| Caseback | Screw-down, carrying the Daini lightning-bolt mark | — |
| Dial | Silver | Silver |
| Dial text | KING SEIKO / CHRONOMETER on some executions | — |
| Hour markers | Applied faceted markers | — |
| Hands | Faceted dauphine | Faceted dauphine |
| Movement | Manual wind | Manual wind |
| Caliber | 4420A | 4502A |
| Manufacturer | Seiko (Daini Seikosha) | Seiko (Daini Seikosha) |
| Winding | manual | manual |
| Frequency | 18,000 vph | 36,000 vph |
| Jewels | 25 | — |
Compare 44-9990 with another generation