Compare Studio
6306-7001 vs 6309-7040
Differences are highlighted. Rows where both references share a value are dimmed.
| Specification | ||
|---|---|---|
| Production | 1976–1982 | 1976–1988 |
| Era | JDM cushion diver | Export cushion diver |
| Status | discontinued | discontinued |
| Case diameter | 44mm | 44mm |
| Lug width | 22mm | 22mm |
| Case material | Stainless steel | Stainless steel |
| Construction | Cushion case, crown at 4 | Cushion case, crown at 4 |
| Bezel | Unidirectional 60-minute | Unidirectional 60-minute |
| Crystal | Hardlex | Hardlex |
| Crown | Screw-down crown at 4 | Screw-down crown at 4 |
| Caseback | Screw-down with a tsunami (wave) medallion | Screw-down with a tsunami (wave) medallion |
| Water resistance | 150m | 150m |
| Dial | Black | Black |
| Dial text | Japanese-market dial | — |
| Hands | Baton hour and minute, lollipop seconds | Baton hour and minute, lollipop seconds |
| Lume | Tritium | Tritium, then LumiBrite on late examples |
| Lume type | Tritium | — |
| Movement | Automatic | Automatic |
| Caliber | 6306A | 6309A |
| Manufacturer | Seiko (Suwa Seikosha) | Seiko |
| Winding | automatic | automatic |
| Frequency | 21,600 vph | 21,600 vph |
| Jewels | 21 | 17 |
| Complications | Day-date with a Kanji/English day wheel, hacking seconds | Day-date; non-hacking, non-hand-winding |
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