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, this bare bones beauty more than proves that less is in fact, more. This example from April of ‘87 is a prime example of how the right amount of wear can make a great tool watch even more appealing. The matte black dial is spotless. The hour markers are free degradation or discoloration, and the luminous material has not a hint of patina. The hands have retained their mirror finish, and are free of any oxidation or corrosion. The bezel rotates with a firm click in either direction, and though the insert shows a moderate amount of wear, it is even throughout and the markings are still clearly legible. Contrasted against the flawless dial and hands, the bezel adds just the right amount of character to this 38 year old tool watch. The case is unpolished with some light wear throughout, but the factory finishes are still clearly visible, and the corners are crisp. The case back shows very little wear the original markings are still clear and well defined. 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. Both the day and the date can be quickset via the crown in the second position. We’ve paired it with a an oxidized Uncle Seiko GL-831 flat vent for a fit and finish as close as it gets to the original. Completely original aside from a replacement mineral crystal, it is a true Seiko icon, and a must have for any collector.

Uncle Seiko Oxidized GL-831 Flat Vent Black Composite

Serviced- 2/25

Diameter- 44mm

Lugs- 22mm