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Brand/Model: Seiko Chronograph “John Player Special”
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Reference: 6138-8030
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Movement: Automatic (self-winding, no battery required)
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Dial Size: 41mm
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Dial: Black base dial with dual golden sub-dials (12-hour and 30-minute registers)
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Functions: Chronograph, Tachymeter scale, Day-Date at 3 o’clock
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Case Material: Stainless Steel with brushed finish
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Crystal: Hardlex mineral glass
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Bracelet: Stainless Steel (period-correct)
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Caseback: Signed Seiko, model and serial engraved (Japan made)
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Era: Circa 1970s