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1977 Seiko Chronograph (Ref. 6138-0011) "UFO"
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Seiko 6138-0017 'UFO' - January 1972
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Seiko 6138 UFO Chronograph: The Quintessential "Dad Watch" | The Watch Site
Vintage Icons: A Seiko 6138 Chronograph Collector's Guide — 60Clicks
