If it came down to owning just one watch, there’s no question that Seiko’s 6309-7040/49 is a strong contender. Still their top selling diver to date, it’s a tool watch so perfectly executed, it remains firmly at the top of our list. Balance, contrast, and contouring all neatly assembled into a finished product that is much greater than the sum of its parts. A bare bones beauty that more than proves the adage “less is more.” This stunner from June of ‘77 is a prime example. The matte black dial is spotless, and carries the Suwa “S” logo above the six o’clock marker. This signifies its early production, and that it was built and cased completely in Japan. The hour markers are free degradation or discoloration, and the luminous material has developed an even “sand” patina. The hands have retained their bright polished finish, and the luminous material has developed a slight gray patina throughout. The bezel rotates smoothly with a firm “click” in either direction, and the insert has just a few blemishes. The case is unpolished, and it’s original finishes are still clearly intact. The case back markings are clear and crisp, and its free of errant tool marks. Both the case back and crown screw down tightly with ample threading. The 6309A is keeping near perfect time post service, and ready for many more years of reliable service. We’ve paired it with a gray “tropic” style strap that’s both versatile, and comfortable on the wrist. Completely original aside from a replacement crystal, it is a true Seiko icon, and a must have for any collector.

CNS “Tropic” Style Gray Rubber Strap

Serviced 7/8/21

Diameter- 44mm

Lugs- 22mm