For sale is a vintage Seiko 6309-7040, one of the most iconic and collectible Seiko dive watches ever produced. Known among enthusiasts as the “Turtle” due to its cushion-shaped case, this model was produced from the late 1970s through the late 1980s and remains highly sought after for its reliability, ruggedness, and classic design. This watch is admired for its vintage charm and connection to Seiko’s professional dive heritage. The cushion case wears comfortably despite its bold size, and the 6309 movement is renowned for its durability. * **Model:** Seiko 6309-7040 * **Movement:** Automatic 6309A, 17 jewels, 21,600 bph (non-hacking, non-hand-winding, reliable workhorse) * **Case Size:** 45 mm diameter (excluding crown), 22 mm lug width * **Dial:** Original matte black with large luminous markers for excellent legibility * **Crystal:** Hardlex mineral * **Water Resistance (originally rated):** 150m diver’s watch * **Crown:** Screw-down at 4 o’clock, classic Seiko diver design * **Caseback:** Solid stainless steel, engraved with Seiko’s tsunami logo * **Strap:** New aftermarket tropic strap **Condition:** * Good overall condition (please see photos), except pip is missing on bezel (replacement bezel insert included). * Movement upgraded to 6319A * Keeps good time and all functions working properly. **Price:** $250, UPS insured shipping CONUS included. **Payment Methods:** Zelle preferred. PayPal F&F or G&S (buyer covers fees if using G&S) available for buyers with strong feedback **Includes:** Watch only along with replacement bezel insert. **Timestamp:** [https://imgur.com/a/seiko-6309-7040-YLColow](https://imgur.com/a/seiko-6309-7040-YLColow) EDITED to reflect movement upgraded to 6319A