There are many vintage Seiko divers popular with collectors, but none more so than the venerable 6309 for sale here - a seldom seen all-original mid-1980 Seiko 6309-7049 Suwa dial automatic diver. This Seiko diver comes with a Clockwork Synergy NATO strap, a rubber Seiko dive strap, and a Seiko bracelet.

The 6309 series of diving watches was the third generation of Seiko’s recreational/professional divers.  The 6309 line replaced the 6105 in 1976 and was produced until 1988, when Seiko replaced it with the 7002 diver.  6309’s were a successful effort by Seiko to improve the 6105 movement, which allowed for greater lifespan, robustness, and ease of maintenance – not to mention they look great on the wrist.

The 6309 line was produced in two separate case variations: an earlier cushion case, popularly known as the “turtle” for the appearance of its cushion case, which was produced between 1976-88 (offered for sale here), and a slimmer case version from 1982-88.  The 6309 was popular with the U.S. military akin to the Seiko model it replaced, the 6105, its (much more expensive) forefather, and quickly became the staple of the working diver.  The 7049 was designated for the North American market, and the 7040 was for the Japanese Domestic market and the rest of the world.


This vintage Seiko diver comes with two nylon NATO straps, rubber Seiko Z22 dive strap, Pelican travel case, and springbar tool.

Mid-1980 Seiko 6309-7049 Suwa Automatic Diver

  • DIAL: Original black Seiko and Suwa-signed dial. This 6309 has the lesser seen dial variant, the “Suwa" dial, which refers to the use of the Suwa stylized “S” symbol used to designate a watch was made at the Seiko Suwa factory in Japan. The Suwa dial was used from 1976 to circa 1980, and has the Suwa symbol just below the vibrant red “Water 150m Resist” text. It also has the text “Japan 6309-704L T” along the bottom edge of the dial. The date window has a deep bevel around it (unlike 6309 aftermarket dials), and the case back has the correct “Japan A” on it near the bottom. Original patina’ed hands; Spanish/English day variants and date at the chamfered 3 o'clock position work correctly as designed. Lume shines.


    BEZEL: Bi-directional and firmly ratchets with a satisfying click; original bezel insert in great condition, a relative rarity. Seiko font and lume pip at 12 o’clock position.


    CASE: Original hefty 44mm (w/o crown, 44.5mm with) x 45mm stainless steel cushion case. Matching original caseback.


    CRYSTAL: Hardlex crystal, scratch-free.


    BAND: This 6309 comes with two 22mm nylon NATO straps, with stainless steel hardware - both are comfortable and stylish manners to complete and wear this vintage Seiko 6309. We also include a Seiko Z22 flat vent rubber dive strap, which these divers originally came with.


    MOVEMENT: Original 6300-series Seiko automatic movement, 17 jewels, manufactured in August 1981, which beats at 21,600 beats per hour.


    CROWN: Original screw-down unsigned stainless steel crown.

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