For sale is my Seiko SPB143 (first generation), a highly regarded modern Seiko diver with classic proportions and excellent wearability. The watch is currently fitted with a Seiko MarineMaster quick-adjust clasp (≈$100 upgrade), which greatly improves on-the-fly comfort. The original clasp and a spare bracelet link are also included. Condition: Very good overall condition with normal light wear from use. Crystal is clean and the bezel is properly aligned. Timekeeping is currently approximately ~20 seconds per day slow, and the hands show slight misalignment (common and correctable during service). This has not affected functionality. It was worn very sparingly in a larger rotation, so the timekeeping variance did not bother me. The watch has not been serviced to address this. Bracelet is currently sized for approximately a 7.5” wrist; spare link included. Included: • Seiko SPB143 (1st gen) • MarineMaster quick-adjust clasp (installed) • Original Seiko clasp • Spare bracelet link Price: 💰 $775 USD — includes shipping to CONUS Payment via PayPal (FF preferred; GS ok for established members at buyer’s expense). Happy to provide timestamp, additional photos, and happy to video call to verify. Thanks for looking!