An enormous change is coming to the Grand Seiko Evolution 9 assortment this season, so massive that it needs to be cut up into two phases, with a complete of 9 contemporary references between them: 5 Spring Drive fashions based mostly on the Spring Drive U.F.A. Caliber 9RB2 will arrive in September, adopted by 4 mechanical fashions based mostly on the calibre 9SA5 in October. Seven of the 9 will are available in Grand Seiko’s proprietary Ever-Good Metal alloy, a cloth recognised for its excessive resistance to corrosion and vibrant color, whereas the remaining two shall be fabricated from Excessive-Depth Titanium. All will sport bracelets with extra pronounced tapering from lug to clasp, geared up with the brand new three step micro-adjustment clasp designed to fine-tune slot in 2mm increments with out the usage of separate instruments.
Of the 5 novelties within the first batch, essentially the most distinguished is likely to be the moody, monochromatic SLGB007, which presents the Lake Suwa dial motif in black for the primary time, to evoke the water floor reflecting faint moonlight, fitted with a 40mm case and bracelet of Excessive-Depth Titanium. The opposite 4 references are updates of beloved fashions now housed within the shinier and extra scratch-resistant Ever-Good Metal, and are made up of two with a dark-blue Lake Suwa dial motif, to symbolize the lake’s look in early daylight, in 40mm (SLGB013) and in 37mm (SLGB015); and the traditional White Birch and Atera Valley motifs (SLGB009 and SLGB011, respectively).
A motion unveiled in April 2025 within the type of the Evolution 9 Spring Drive SLGB001 and SLGB003 Ice Forest references (each of which additionally bore the microadjustment clasp), the 9RB2 is distinguished by an annual accuracy of +/- 20 seconds, which is an unlimited enchancment over earlier generations of Spring Drive actions. The latest was the 9RA2 launched in 2021, which had an accuracy of +/- 10 seconds a month. This vital leap is made attainable by vacuum-sealing each the crystal oscillator and the built-in circuit to minimise interference from the surroundings.
The second batch contains a quartet all powered by the automated mechanical Caliber 9SA5, which operates at 36,000vph with a high-frequency Twin Impulse Escapement, and comprises a twinbarrel system with two mainsprings offering an 80-hour energy reserve. The birch dial sample is rendered in three variations – in winter snow (SLGH031), at evening (SLGH029), and in summertime daylight (SLGH033) – and the Genbi Valley motif, seen on the pale-green dial of the limited-edition SLGH021 from 2024, now joins the everlasting core assortment, although right here expressed in mild blue, as SLGH035.
This story was first seen as a part of the WOW #86 Autumn 2026 situation.
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