Seiko Turtle Diver (Ref. 6306-7001) "JDM", 1978

Dealer description — Craft & Tailored

The Seiko 6306-7001 is the Japanese Domestic Market (JDM) version of Seiko’s third-generation professional diver, produced from 1976 to 1988. A counterpart to the 6309-7049 made for the American market, the 6306-7001 is powered by a superior movement featuring hacking seconds and a higher jewel count—making it a favorite among collectors and enthusiasts alike. Both variants share the same robust case dimensions: 45mm wide, 48mm lug-to-lug, and 13mm thick, with a 22mm lug width. The case itself is classic Seiko tool-watch design—circular brushing on the top, polished sides and caseback, and a strong mid-case line separating the surfaces. The screw-down crown at 4 o'clock ensures excellent water resistance and ergonomic functionality. Notable features include a double-row knurled bezel for enhanced grip, a bold and highly legible handset designed for underwater visibility, and a day/date complication with quickset functionality. Altogether, the 6306-7001 offers a rugged, reliable, and function-forward design that has influenced Seiko's diver lineage for decades. Culturally, this era of Seiko Divers holds a place in history—its sibling model was famously worn by Ed Harris in The Abyss, and Mick Jagger has been seen wearing his personal example. While most surviving examples show heavy wear from serious use, this particular piece remains in excellent, original condition—an increasingly rare find. SPECS Stock # SKO63067001 Brand Seiko Style Diver Model 6306-7001 Serial 80XXXX Size Men's Material Stainless Steel Dial Matte Black Millimeters 45 Strap 2pc Rubber Uncle Seiko Strap CASE & BRACELET The robust case remains in wonderful condition, exhibiting minor signs of honest wear and minimal evidence of being previously polished. The original bezel insert shows honest wear, though no cracks or chips. The original screw-down crown is located at 4 o'clock. The case back retains all of its original factory engravings and markings in deep and legible condition. The watch comes supplied on a 2pc rubber Uncle Seiko strap. DIAL & HANDS The matte black dial is in exceptional condition, showing no damage or notable elements of age. The lume plots have taken on a handsome ivory patina and show no degradation when inspected under UV light. The original lume hands have aged darker than the dial, to a medium grey patina, and exhibit no degradation when inspected under UV light. ACCESSORIES None. The watch is keeping time, but the service history is unknown. A movement service can be provided upon request.