VINTAGE SEIKO 7A48-5010 SPORTS 100 MOONPHASE CHRONOGRAPH (FEB 1986) FULLY TESTED & 100% OPERATIONAL Up for sale is a superb example of the vintage Seiko 7A48-5010 Sports 100 quartz chronograph, featuring an integrated moonphase display and date sub-dial. Part of Seiko’s famous 7Axx movement family—the world's first analog quartz chronographs—this watch boasts a high-grade 15-jewel metal movement that can be fully serviced and adjusted, unlike modern plastic quartz modules. KEY DETAILS & CONDITION: - MOVEMENT & FUNCTIONS: 100% Fully Working. All pushers (2, 4, and 10 o'clock) are crisp and responsive. Chronograph starts, stops, and resets precisely to zero. The 1/10th second sub-dial, date indicator, and moonphase wheel all function smoothly as intended. - DIAL & HANDS: Original dark dial with gold sub-dial rings, gold hands, and rich moonphase display at 12 o'clock. - CASE: Original stainless steel case (39mm diameter) with gold-tone bezel and pushers. Authentic vintage patina and minor surface wear consistent with age (see high-res photos). Case back clearly stamped 7A48-5010 and serial number 629011 (Feb 1986 production). - STRAP: Fitted with a brand new, unused brown leather strap with alligator grain finish. - INCLUDED: Watch only (no original box/papers). Please review all high-resolution photos for exact cosmetic condition. Questions are welcome!