1975 Seiko Automatic "Bullhead" Chronograph (Ref. 6138-0049) Brown Dia
1977 Seiko 6138-0040 SpeedTimer "Bullhead" Chronograph | DC Vintage Watches
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SET DIAL HANDS STEEL BEZEL INSERT SEIKO CHRONOGRAPH BULLHEAD BROWN 6138-0040 41 | WatchCharts
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The Seiko Bullhead Collectors Guide
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Seiko Speedtimer 6138-0040 Brown Bullhead – Belmont Watches
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Seiko Bezel 6138-0040 Tachymeter Original Bullhead Black Chronograph Old Stock | eBay
Steel bezel w/ insert for Seiko 6138-0040 6138-0049 Bullhead chronogra – A parts
