Grand Seiko released the SBGH005 in 2009 to reintroduce hi-beat mechanical watches after a 41-year hiatus following the 1968 61GS series. This reference displays both Seiko and Grand Seiko dial signatures because production ran from 2009 to 2017 prior to the brand's corporate separation.
The internal Caliber 9S85 operates at 5 Hz and achieves a 55-hour power reserve because the movement utilizes a Spron 530 mainspring that delivers higher and consistent energy. Seiko engineers also skeletonized the escape wheel and pallet fork using Micro Electro Mechanical System (MEMS) lithography, resulting in weight reduction in the pallet fork to reduce friction and oil spillage.
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, Visible Wear Production: est. 2010s Contents: Watch Only Genre: Dress Watch
Size: 40mm Thickness: approx. 13mm Lug Width: approx. 20mm
Case: Stainless steel, brushed finish, mirrored bevels, visible wear Bezel: Fixed smooth bezel, mirrored finish, visible wear Dial: Black Iwate textured dial, applied markers, date display Hands: Faceted dauphine hands, mirrored finish
Crown: GS-signed, screw-down crown, visible wear Crystal: Dome sapphire crystal, inner A/R coated, visible wear Bracelet: Stainless steel bracelet, visible wear Caseback: Stainless steel, exhibition caseback, screw-down, visible wear Movement: Automatic Caliber: 9S85A Hi-Beat