For vintage Seiko lovers, the 6309-7040/49 “Turtle” diver is a must for any collection. It is still Seiko’s top selling diver to date, and even inspired a reissue in 2015. It’s instantly recognizable, and a personal favorite. Production began in 1976 and continued through 1988 when Seiko transitioned over to the 7002 model. However, in 1982 a slimmer 6309 150m diver emerged, and likely served as an evolutionary testing ground for the next generation of Seiko divers. Enter the 6309-729X, or what many collectors refer to as the “Slim Turtle.” A shorter production run paired with a smaller market distribution meant fewer to go around, and today many of those that are available have been fitted with aftermarket or modified parts. This example from from October of ‘86, however, is the genuine article. The dial is immaculate. The soft matte black finish is even throughout, and the printed text is crisp with negligible fading of the bright red “water resist” lettering. The stippled luminous plots show no degradation, and remain a clean bright white. The hands exhibit some oxidation, but have kept their original luminous windows, and we’ve applied a thin layer of luminous binder to the back of the hands for added support and protection. The bezel rotates smoothly with a firm “click” of the ball bearing in either direction, the insert shows almost no visible  wear, and the original lume pip and acrylic lens still in place. The case is unpolished, and the factory corners and finishes are still intact. The 6309A is keeping near perfect time post service, and the crown and case back both screw down tightly with ample threading. It’s completely original aside from a replacement crystal and we’ve paired it with a Seiko DAL1BP flat vent composite strap for a fit and finish comparable to the original. An influential piece of Seiko diving history whose legacy can still felt today, an all original “Slim Turtle” is a highlight addition to any collection.

Seiko DAL1BP Flat Vent Black Composite Rubber

Serviced- 7/24

Diameter- 42mm

Lugs- 22mm