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6138-8020 vs 6138-8039
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| Specification | ||
|---|---|---|
| Nickname | Panda | John Player Special |
| Production | 1972–1978 | 1976–1979 |
| Era | Round-case two-register | Late 6138 |
| Status | discontinued | discontinued |
| Case diameter | 40mm | — |
| Case material | Stainless steel or gold-tone plated | Gold-tone plated stainless steel |
| Construction | Round case with conventional lugs | — |
| Crystal | Hardlex | Hardlex |
| Crown | Crown at 3; pushers at 2 and 4 | — |
| Dial | Ivory (steel) or black (gold-tone) | Black with gold accents |
| 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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