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 seated 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’s adamant proof that less, is in fact, so much more. This example from May of ‘81 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 earlier 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 a soft khaki patina. The hands have retained their bright polished finish aside from some very minor oxidation, and the luminous material shares the same warm patina as the hour markers. The bezel rotates smoothly in either direction with a firm “click,” and the insert bears only minor wear. The case is unpolished, and it’s original finishes are still clearly visible, with only light signs of wear throughout. The case back markings are clear and crisp, and free of tool marring. Both the case back and crown screw down tightly with ample threading. Post service it’s keeping near perfect time, and ready for many more years of reliable service. We’ve paired it with an Uncle Seiko GL-831 flat vent composite strap for a fit and finish very close to the original. Completely original aside from a replacement crystal, it is a true Seiko icon, and a must have for any collector.

Uncle Seiko GL-831 Flat Vent Black Composite

Serviced- 7/26

Diameter- 44mm

Lugs- 22mm