SLGB003

Main Features

SLGB003 is the first regular model equipped with Spring Drive U.F.A., or Ultra Fine Accuracy. It achieves an exceptional annual accuracy of ±20 seconds, which is extremely high for a mainspring-powered watch.

Movement

Caliber: 9RB2
Driving system: Spring Drive, automatic with manual winding
Power reserve: Approximately 72 hours, or about 3 days
Accuracy: Annual accuracy of ±20 seconds, equivalent to ±3 seconds per month
Jewels: 34

SLGB003 uses the Spring Drive U.F.A. Caliber 9RB2. The movement achieves both high precision and compact sizing, allowing the watch to have a 37.0mm case while still offering around 72 hours of power reserve.

Exterior

Case: Bright Titanium
Case back: Bright Titanium and sapphire crystal
Case back: Screw-down see-through case back
Crystal: Box-shaped sapphire crystal
Coating: Anti-reflective coating on inner surface

The case is made from Bright Titanium, giving the watch a lightweight and practical feel. The see-through case back allows the wearer to view the Spring Drive movement.

Size

Case size: 37.0mm diameter, 44.3mm lug-to-lug, 11.4mm thickness
Band width: 20mm
Maximum bracelet length: 190mm
Weight: 100g

The 37.0mm case makes this model more compact and easy to wear than many modern sports-luxury watches, while the Bright Titanium construction keeps the weight at 100g.

Water Resistance and Functions

Water resistance: 10 bar
Magnetic resistance: Yes
Clasp: Three-fold clasp with push button release and micro-adjustment mechanism
Other features: Power reserve indicator, screw-down crown, metal allergy resistance

The watch includes practical features such as 10 bar water resistance, magnetic resistance, a screw-down crown, a power reserve indicator, and a micro-adjustable clasp.

Spring Drive U.F.A. Appeal

The greatest appeal of SLGB003 is its annual accuracy of ±20 seconds. Spring Drive uses a mainspring like a mechanical watch while applying Grand Seiko’s precision technology developed through quartz watchmaking. This model goes beyond the usual daily or monthly accuracy scale and reaches annual-level precision.

Technology Behind the Annual Accuracy

The quartz oscillator is aged for three months to stabilize its accuracy, then vacuum-sealed together with a newly designed IC to reduce the effects of temperature, humidity, static electricity, and light. For the first time in Spring Drive history, the movement also uses a regulation switch to allow accuracy correction during after-sales service.

Frost-Covered Forest Dial

The dial is inspired by the beauty of frost-covered trees in Shinshu, the birthplace of Spring Drive. Its pale blue tone and precise stamped pattern express the clear atmosphere and icy beauty of the region.

Blue Steel Seconds Hand

The silver-blue dial is paired with a blue steel seconds hand. Thanks to Spring Drive’s smooth sweeping motion, the hand glides quietly across the dial, reinforcing the calm and refined atmosphere of the watch.

Movement Finishing

The movement finishing pays tribute to the natural scenery of Shinshu. The bridge surface uses a matte-style finish to express frost, while diamond-cut ridges, edges, and holes create sharp reflections like stars in the night sky.

Recommended For

This model is easy to recommend for customers looking for Japanese luxury watches, Grand Seiko Spring Drive, Ultra Fine Accuracy, annual accuracy watches, lightweight titanium watches, compact 37mm luxury watches, or a Made in Japan watch that combines natural inspiration with cutting-edge precision.