This discontinued Seiko 5, reference SNK027K1, is known in collecting circles as the "Seiko Seamaster," a title earned from its scalloped bezel and integrated case design. It is a pure expression of the historic Seiko 5 philosophy, which, since 1963, has codified five key attributes including an automatic movement and a single-window day-date display. The transparent caseback reveals the calibre 7S26, a well-regarded "workhorse" movement with 21 jewels and a bi-directional winding system.
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: 8 / 10 | Great Condition, Light Visible Wear Production: Undated Contents: Full-set Genre: Dive Watch
Size: 41mm Thickness: approx. 13mm Lug Width: approx. 20mm
Case: Stainless steel, brushed and mirrored finish, Light Visible Wear Bezel: Stainless steel, fixed, engraved with 10-minute markers, Light Visible Wear Dial: White, applied rectangular markers, day-date window at 3 o'clock Hands: Luminous sword-style hands
Crown: Stainless steel, pull/push at 4 o'clock, Light Visible Wear Crystal: Hardlex crystal, flat, Light Visible Wear Bracelet: Stainless steel bracelet, Light Visible Wear Caseback: Stainless steel, transparent screw-down, Light Visible Wear Movement: Automatic Caliber: 7S26