Grand Seiko Spring Drive UFA Ushio 300 Diver Watches SLGB023 and SLGB025
Grand Seiko expands its Evolution 9 collection with the launch of the Spring Drive UFA Ushio 300 Diver SLGB023 and SLGB025.
Both new models are powered by the Calibre 9RB1 movement, boasting an annual accuracy of ±20 seconds, placing it among the most accurate mainspring-driven watch movements ever made.
UFA, an abbreviation for “Ultra-Fine Precision,” was established in 2025 with the release of the Calibre 9RB2. The new 9RB1 is an evolution of this, maintaining the same performance standards while adapting its architecture to a format specifically designed for divers. fake watch
The movement features an automatic winding system with a power reserve of approximately 72 hours and operates in a typical Spring Drive gliding motion, electronically regulated by a quartz oscillator.
To achieve this level of precision, the oscillator and integrated circuits are vacuum-sealed and calibrated separately, with thermal compensation data programmed into the circuitry.
These models feature a 40.8 mm case, 12.9 mm thick, making them the most compact Grand Seiko dive watch to date.
Both the case and bracelet are crafted from high-strength titanium, a material approximately 30% lighter than stainless steel, contributing to improved wearing comfort while maintaining high corrosion and scratch resistance.
Water resistant to 300 meters/1000 feet, they feature a screw-down crown and case back.
The unidirectional rotating bezel has 120 graduations for precise adjustment and incorporates ceramic inserts for enhanced scratch resistance. best replica watches
A key aspect of the Evolution 9 design language is legibility, achieved through large, faceted hands with sharply defined contours, all coated with Lumibrite luminescent material.
The most striking feature of these two watches is their “Ushio” dial, a theme inspired by the ocean and previously used in the Grand Seiko diving watch collection. The word “Ushio” means “tide” in Japanese, and it’s reflected in the gradient textured dial.
The SLGB023 features a deep blue hue reminiscent of the vast ocean, while the SLGB025 uses a green hue inspired by coastal waters. The power reserve indicator is located on the side of the dial.
The titanium bracelet features a newly developed locking extension clasp.
This system offers three levels of fine adjustment (6 mm) and an 18 mm extension for diving suits, for a total adjustment range of 24 mm. whereguidewatch.com