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Movement: Automatic, 21 Jewels (self-winding, no battery needed)
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Year of Manufacture: October 1971 (based on serial number "170148" on caseback)
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Model Number: Likely from the 7009 or 6309 series (commonly used in Seiko 5 watches of this period)
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Case Material: Stainless steel, brushed finish
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Case Size: 36x40mm
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Strap: 20mm wide blue faux crocodile leather strap (aftermarket)
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Caseback Engraving: "SEIKO, WATER RESISTANT, STAINLESS STEEL, 7009-8730, 170148, JAPAN"