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