The Grand Seiko Evolution 9 Collection 40 mm SLGH017G, known as the "Night Birch," is a distinguished timepiece that exemplifies Grand Seiko's commitment to craftsmanship and innovation. Drawing inspiration from the serene white birch forests near the Grand Seiko Studio Shizukuishi, the watch features a black dial with a textured pattern reminiscent of birch tree bark at night. The 40 mm high-intensity titanium case offers a lightweight and durable structure, ensuring comfort for daily wear. The combination of Zaratsu-polished distortion-free mirror finish and delicate hairline finish on the case provides a harmonious and understated glow, enhancing the watch's elegant appearance.

At the heart of the SLGH017G lies the revolutionary Caliber 9SA5, a high-beat automatic movement that operates at 36,000 vibrations per hour. This movement boasts an impressive 80-hour power reserve and an accuracy of +5 to -3 seconds per day. The 9SA5 features Grand Seiko’s unique Dual Impulse Escapement and a free-sprung balance, contributing to enhanced precision, shock resistance, and efficiency. The movement's design includes a thinner profile and twin barrels, allowing for extended power reserve while maintaining a compact structure.

The SLGH017G is equipped with a high-intensity titanium bracelet that tapers from 22 mm to 20 mm, providing both aesthetics and comfort. The bracelet features a three-fold clasp with a push-button release, ensuring a secure fit. With a water resistance of 10 bar and magnetic resistance of 4,800 A/m, this timepiece is designed for everyday wear, combining style and functionality. The watch's design philosophy, known as the Evolution 9 Style, emphasizes legibility, ease of use, and beauty, setting new standards for Grand Seiko's signature in the years to come.