Compare Studio
6138-0011 vs 6138-8020
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| Specification | ||
|---|---|---|
| Nickname | UFO | Panda |
| Production | 1970–1979 | 1972–1978 |
| Era | Lugless 'Yachtsman' case | Round-case two-register |
| Status | discontinued | discontinued |
| Case diameter | — | 40mm |
| Case material | Stainless steel | Stainless steel or gold-tone plated |
| Construction | Lugless round case with an integrated bracelet mount, giving the appearance of no lugs at all | Round case with conventional lugs |
| Bezel | Internal rotating bezel | — |
| Crystal | Hardlex | Hardlex |
| Crown | Crown at 4; chronograph pushers at 2 and 4 | Crown at 3; pushers at 2 and 4 |
| Dial | Blue, green or grey depending on variant | Ivory (steel) or black (gold-tone) |
| Lume | Tritium | Tritium |
| Movement | Automatic chronograph | Automatic chronograph |
| Caliber | 6138B | 6138B |
| Manufacturer | Seiko | Seiko |
| Winding | automatic | automatic |
| Frequency | 21,600 vph | 21,600 vph |
| Complications | Chronograph (30-minute and 12-hour totalisers), day-date | Chronograph (30-minute and 12-hour totalisers), day-date |
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