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Grand Seiko
Grand Seiko 44GS Heritage 36.5mm U.S. Exclusive "Tsuyu" SBGW311

Grand Seiko 44GS Heritage 36.5mm U.S. Exclusive "Tsuyu"


Grand Seiko
  • $5,900.00

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Celebrating the changing seasons with a new US-exclusive capsule

Envisioning Mt. Iwate as the "Tsuyu" rainy season takes shape in early Summer, this lush green new U.S. Exclusive also pulls from Grand Seiko's legendary 44GS case architecture. Released in 1967, this case design was the first to define the Grand Seiko Style and has evolved into a modern interpretation with contemporary practicality. This new time-only reference embodies Grand Seiko Style in a stylish mid-size case at 36.5mm diameter with manually wound mechanical Caliber 9S64, providing the watch a 72-hour power reserve despite its compact size.

Built in-house by Grand Seiko, Caliber 9S64 is assembled by hand by the artisans of Grand Seiko's Studio Shizukuishi. It is a mechanical hand-winding movement with 72 hours of power reserve and an accuracy rating of -3 to +5 seconds per day. 


  • Case Material : Stainless steel
  • Glass Material : Dual-curved sapphire
  • Glass Coating : Anti-reflective coating on inner surface
  • Case size : Diameter 36.5mm × Thickness 11.6mm, 42.7mm lug-to-lug
  • Strap: Stainless steel bracelet with tri-fold clasp and push-button release
  • Lug width: 19mm
  • Caliber no. : 9S64
  • Movement Type : Handwound mechanical, 24 jewels, time-only with hacking seconds
  • Power reserve : Approx. 72 hours (3 days)
  • Accuracy : +5 to -3 seconds per day (when static) / +10 to -1 seconds per day (normal usage accuracy)
  • Water resistance : 10 bar (screwdown crown & caseback)
  • Magnetic resistance : Equipped

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