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File:Seiko Speed-Timer Chronograph Automatic 6138-0040 ("Bullhead"), 1976.jpg - Wikimedia Commons
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SEIKO 6138-0040 chronograph automatic watch BULLHEAD Cal. 6138-B ALL ORIGINAL *** SPECTACULAR *** Seiko Vintage watches - Watches83
![WTS] Seiko Bullhead 6138-0040 Chronograph | WatchCharts](https://cdn.watchcharts.com/listings/61c4ece4-5f77-4299-9279-03721180e9d5.jpg "WTS] Seiko Bullhead 6138-0040 Chronograph | WatchCharts")
WTS] Seiko Bullhead 6138-0040 Chronograph | WatchCharts
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Seiko Bullhead Chronograph NOS 6138-0040
Seiko Bullhead NOS (New Old Stock) 6138-0040 – TWS
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