New 40.8mm Grand Seiko U.F.A. Spring Drive Ushio 300 Diver SLGB023 & SLGB025

Grand Seiko finally did it! The new Grand Seiko Spring Drive U.F.A. Ushio Diver 300 SLGB023 and SLGB025 are only 40.8mm in diameter and 12.9mm thick. And that is just the tip of the iceberg! With U.F.A Spring Drive in its arsenal, Grand Seiko, in any category of watch, has the potential to create the most accurate mainspring-driven watch in the world, with its accuracy within 20 seconds per year. Dive watches are already a bit romantic in a world with dive computers, so a proper dive watch needs to have legitimate, highly-regulated accuracy to really put the tool in tool watch. While in 2025, the debut of U.F.A. Spring Drive and a micro-adjust clasp were major headlines for Grand Seiko, the more subtle and significant reveal was the fact that Grand Seiko could now place an automatic Spring Drive movement, its most accurate no less, in a smaller 37mm case. This meant the door was now open for Grand Seiko to scale down its dive watches to more versatile proportions. Naturally, the dials are both stunning, utilising the Ushio pattern – one of the many beloved dial patterns and layouts the brand offers. It means tide in Japanese. A perfect pattern for a dive watch. The SLGB023’s blue dial is said to reflect the vast expanse of the sea through a gradient that captures light streaming into the deep ocean, while the SLGB025’s green dial draws from the tranquil beauty of shallow coastal waters near the shore. The SLGB023 & SLGB025 bracelets both include a newly developed locking extension clasp with the micro-adjustment introduced last year. In addition to a three-step micro-adjustment that allows for up to 6mm of fine-tuning, the extension feature, designed to be used with a diving suit, enables an additional 18mm, providing a total of 24mm of adjustment. The 'GS' emblem on the clasp functions as the locking mechanism, preventing the accidental release of the clasp – a red indicator when the emblem is slid down indicating it is unlocked. With the SLGB023 and 025, and its 40.8mm size, Grand Seiko has finally brought all of the alluring key distinctions it offers, impeccably well-finished cases, a beautiful nature-inspired dial, and a calibre with unparalleled accuracy, to the sweet spot a sizeable audience has been begging the brand to do for years and years. What do you think of these two new watches? Which configuration would you pick? Let us know in the comments. #grandseiko ------------------------------- https://grandseikoboutique.com.au/product/SLGB023 https://grandseikoboutique.com.au/product/SLGB025 ------------------------------- BRAND - GRAND SEIKO MODEL - U.F.A. SPRING DRIVE USHIO 300 DIVER REFERENCE - SLGB023 SLGB025 CASE DIMENSIONS - 40.8MM (D) X 12.9MM (T) CASE MATERIAL - HIGH-INTENSITY TITANIUM WATER RESISTANCE - 300 METRES, SCREW-DOWN CROWN CRYSTAL(S) - SAPPHIRE FRONT DIAL - SLGB023: GRADIENT BLUE, USHIO-PATTERNED SLGB025: GRADIENT GREEN, USHIO-PATTERNED STRAP - HIGH-INTENSITY TITANIUM BRACELET, LOCKING EXTENSION MICRO-ADJUST CLASP MOVEMENT - 9RB1, IN-HOUSE, AUTOMATIC, SPRING DRIVE POWER RESERVE - 72 HOURS FUNCTIONS - HOURS, MINUTES, SECONDS, POWER RESERVE INDICATOR AVAILABILITY - JUNE 2026 PRICE - US$12,400 A$17,700 ------------------------------- Read more articles: https://timeandtidewatches.com Shop: https://shop.timeandtidewatches.com ------------------------------- MB01OTIXZLPJ5VH INSTAGRAM @timetidewatches TikTok https://www.tiktok.com/search?q=timeandtidewatches T+T Shop Instagram https://www.instagram.com/timetideshop/