Seiko 6309-510A A Seiko 5 model with a subtle military character, highlighted by its 24-hour inner scale and textured blue dial. The jubilee bracelet is aftermarket; other components remain original. Ref / Serial / Year / Origin • Ref: 6309-510A • Year: 1975 • Origin: Japan • Movement: Automatic – Cal. 6309 • Calendar: Bilingual • Diameter: 36 mm Technical Details • Automatic Cal. 6309 • Military-inspired 24-hour inner scale • Original textured blue dial • Stainless steel case • Aftermarket jubilee bracelet • Day-Date (bilingual) Condition • Light age-related marks on the case • Original dial, clean condition • Movement runs smoothly and keeps time well • Crystal clean • Bracelet aftermarket; other parts original The item will be carefully and securely packaged, and shipped via FedEx or UPS.