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 that less is in fact, more. This example from May 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 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 an even sandy patina. The hands have retained their bright polished finish, and the luminous material has developed a slight gray patina throughout.The bezel rotates smoothly in either direction, and the insert has moderate even wear. The case is unpolished, and it’s original finishes are still visible, though signs of wear are visible throughout. The case back markings are clear and crisp, and only a couple of light tool marks are present. 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 Seiko Z-22 flat vent strap that’s nearly identical to the original, 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.

Seiko Z-22 Flat Vent Black Rubber Strap with Stainless Steel Buckle

Serviced 8/4/19

Diameter- 44mm

Lugs- 22mm