Important Notice: This 'NOS' authentic, discontinued timepiece is unworn inventory that has remained in storage for a prolonged period and is not equivalent to a factory-fresh modern retail watch. Due to age and historical handling, the item may exhibit "storage wear" such as fine hairline scratches or minor abrasions. Buyers should note that internal lubricants may have dried or gaskets degraded, so a professional service and pressure test are recommended to ensure optimal performance.
Released in 2022 alongside the limited edition SRPJ39 designed by Olympic skateboarder Yuto Horigome, the 5 Sports SRPJ37K1 features a black hard-coated 42.5mm case that transitions the line's dive-oriented SKX design into the streetwear category. The dial features a green camouflage pattern with a English and Spanish calendar wheel.
The case provides 100 meters of water resistance and is powered by the in-house Caliber 4R36 automatic movement, delivering hacking, hand-winding capabilities, and a 41-hour power reserve.
Established in 1881 by Kintarō Hattori, Seiko is defined by its principle of complete vertical integration, manufacturing every single component of its timepieces in-house. They were the primary catalyst of the "Quartz Crisis" with the commercial release of the 1969 Astron—the world’s first quartz watch—the brand simultaneously advanced mechanical horology, developing one of the first automatic chronographs and pioneering high-frequency movements to challenge Swiss standards.
Seiko's relentless innovation continues with proprietary technologies like Spring Drive, which blends mechanical power with quartz precision. This technical mastery underpins Seiko's legacy in creating archetypal and exceptionally durable tool watches, particularly in the domain of professional diving.
Overall Grade: 9.5 / 10 | NOS Condition, Unworn Production: 2026 Contents: Full-set Genre: Dive watch
Size: 42.5mm Thickness: 13.4mm Lug Width: 22mm
Case: Stainless steel, PVD coated, satin and mirrored finish Bezel: Unidirectional, black aluminum dive insert, matte finish Dial: Green camouflage dial, applied markers, day and date display Hands: SKX-style arrow and syringe hands, lumed
Crown: PVD coated, push/pull 4 o'clock crown Crystal: Hardlex mineral crystal Bracelet: Black nylon NATO strap Caseback: Stainless steel, exhibition back, screw-down Movement: Automatic Caliber: 4R36