1977 Seiko 6138-0040 "Bullhead" Chronograph
Seiko Chronograph 'Bullhead' 6138-0040. Superb original example. 1977. – Century Time Watches
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1977 Seiko Chronograph Automatic 'Bullhead' reference 6138-0040 – Blue – Vintage Watch Specialist
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Seiko Bullhead Chronograph NOS 6138-0040
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Vintage Watch | Seiko Bullhead 6138 0040 Chronograph – Samurai Vintage Co.
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Seiko - Bullhead "Speed-Timer" JDM - 6138-0040 - Men - 1970-1979 / CoinsTree
