Thank you for viewing. This is the Seiko "First Quartz Tuna" 7549-7010, a Seiko masterpiece. It's a 300m water-resistant diver's watch with an outer protector, designed for saturation diving, and represents the culmination of the technology of its time. This is an original piece from 1980, and remains a highly sought-after and rare watch. The movement was overhauled in November 2025, and the internal condition is also very good. Immediate purchase without comments is also welcome. This watch is packed with the charm of the original, and there aren't many examples of this age of diver's watches in such excellent condition. While recent re-editions are appealing, the joy of owning the original is unparalleled. I confidently recommend this as a masterpiece that can be passed on to the next generation, even after half a century. ■ Brand: SEIKO ■ Model Number: 7549-7010 ■ Year of Manufacture: 1980 ■ Operating Status: Normal (Overhauled in November 2025) ■ Movement: Quartz ■ Dial Color: Black (Very good condition with minimal discoloration.) ■ Hands: Original (Beautiful condition) ■ Material: Stainless Steel ■ Face: W 47mm (excluding crown) x H 43.5mm (including lugs) / Thickness 14.2mm ■ Band: New Seiko urethane strap, Jubilee bracelet (new, max 21cm), and a new shark mesh bracelet (new, max 22cm, please specify your desired size after purchase.) ■ Bezel: Operates normally ■ Bezel Insert: Original (Minor scratches due to age, beautiful condition) ■ Crown: Normal ■ Crystal (Glass): Original domed glass, polished, beautiful condition (with minor scratches that are not noticeable) ■ Condition: Overall in beautiful condition, with minor scratches. Polished and cleaned. ■ Battery: New in November 2025 ■ Returns are not accepted for any reason, including differences in image or size. *No returns or exchanges. ■ Accessories: Watch, Jubilee bracelet, link removal tool, urethane strap, shark mesh bracelet, pins, box ■ Notes: Regarding vintage watches While the water resistance of this 45-year-old vintage diver's watch is sufficient for daily life, we do not recommend using it in places with high water pressure. This model is difficult to restore to perfect condition, and we hope that those who understand vintage watches will purchase it.