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6138-0030 vs 6138-0011
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| Specification | ||
|---|---|---|
| Nickname | Bullhead | UFO |
| Production | 1971–1978 | 1970–1979 |
| Era | Top-pusher 'Bullhead' case | Lugless 'Yachtsman' case |
| Status | discontinued | discontinued |
| Case material | Stainless steel | Stainless steel |
| Construction | Asymmetric case with the crown and both chronograph pushers on the upper flank, giving the 'bull horns' silhouette | Lugless round case with an integrated bracelet mount, giving the appearance of no lugs at all |
| Bezel | Fixed outer bezel with tachymeter | Internal rotating bezel |
| Crystal | Hardlex | Hardlex |
| Crown | Crown and pushers at the top of the case | Crown at 4; chronograph pushers at 2 and 4 |
| Dial | Reddish-brown or black depending on variant | Blue, green or grey depending on variant |
| 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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