The Grand Seiko Heritage Collection Automatic 40 mm SBGH353G is a distinguished timepiece that embodies the brand's commitment to precision and traditional Japanese aesthetics. Drawing inspiration from the Shūbun season, which marks the autumnal equinox in Japan's ancient calendar, the watch features a deep blue dial that reflects the serene beauty of clear night skies illuminated by the moon and stars. The gold-toned Grand Seiko lettering and seconds hand stand out in sharp relief against the dial, echoing the way celestial bodies illuminate the night sky.

Encased in Ever-Brilliant Steel, the SBGH353G offers enhanced corrosion resistance and a radiant finish. The case measures 40.0 mm in diameter, 47.0 mm lug-to-lug, and 12.9 mm in thickness, providing a comfortable fit for various wrist sizes. The watch's wide dial opening was achieved through a bezel-free construction, lending it a distinctive appearance on the wrist. A box-shaped sapphire crystal with an anti-reflective coating on the inner surface ensures optimal clarity and durability.

Powering the SBGH353G is the Hi-Beat automatic Caliber 9S85, hand-assembled by skilled craftsmen at the Grand Seiko Studio Shizukuishi. This movement offers a power reserve of approximately 55 hours and a mean daily rate of +5 to -3 seconds per day under static conditions. The watch also boasts a water resistance of 10 bar, making it suitable for daily wear. Completing the timepiece is a stainless steel bracelet with a three-fold clasp and push-button release, ensuring both comfort and security.