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Seiko bullhead for $908 for sale from a Private Seller on Chrono24
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1977 Seiko Chronograph Automatic 'Bullhead' reference 6138-0040 – Blue – Vintage Watch Specialist
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Seiko 6138-0040 Bullhead for $872 for sale from a Private Seller on Chrono24
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Seiko Bullhead 6138 0040 for $1,270 for sale from a Private Seller on Chrono24
HOW TO BUY A SEIKO 6138-0040/0049 "BULLHEAD" CHRONOGRAPH - A Collector's Buying Guide | WatchUSeek Watch Forums
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Lot-Art | Seiko - Bullhead - 6138-0040 - Men - 1970-1979
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Vintage Seiko Bullhead Automatic Chronograph Watch Ref: 6138 - 0040 | eBay
Vintage Seiko BullHead Automatic Chronograph Men's Watch 6138-0040 Early 1970s - Seiko
