Grand Seiko Unveils 37mm SLGB015 at EUR 10,400 With ±3-Second-Per-Month Spring Drive
Updated
Updated · Monochrome Watches · Jun 24
Grand Seiko Unveils 37mm SLGB015 at EUR 10,400 With ±3-Second-Per-Month Spring Drive
2 articles · Updated · Monochrome Watches · Jun 24
Summary
Grand Seiko’s new SLGB015 joins the permanent collection as a 37mm Evolution 9 model in Ever-Brilliant Steel, arriving in early September 2026 at EUR 10,400.
The watch pairs the dark-blue Lake Suwa dial pattern with the calibre 9RB2 Spring Drive UFA, which is rated to ±3 seconds per month and offers a 72-hour power reserve.
Its 37mm case is 11.4mm thick with a 44.3mm lug-to-lug span, 100 meters of water resistance, a screw-down crown and a sapphire display back.
A 3-step micro-adjustment clasp returns on the steel bracelet, adding tool-free 2mm adjustments that the earlier steel Ice Forest SLGB005 lacked.
The SLGB015 effectively combines features introduced across the 2025 UFA launches, making it the first model in this 37mm sub-collection to bring back the Lake Suwa motif.
Does Grand Seiko's new high-tech movement and adjustable clasp finally perfect the steel sports watch, or just inflate its price?
Grand Seiko's new watch boasts record-breaking mechanical accuracy. In the smartwatch era, is this technological achievement still relevant to consumers?