Grand Seiko Heritage SBGA437 Spring Drive Silken Sunray Watch
Grand Seiko Heritage SBGA437 Spring Drive Silken Sunray Watch
The Grand Seiko SBGA437 is a Heritage Collection watch featuring a distinctive silken sunray dial inspired by Shinshu’s silk-production heritage. Its refined proportions and Spring Drive movement make it a practical everyday Grand Seiko with a distinctive dial character.
The stainless-steel case measures 40.0 mm in diameter and houses Grand Seiko’s Caliber 9R65 Spring Drive movement, offering approximately 72 hours of power reserve and accuracy of ±15 seconds per month. The dial includes a date display at 3 o’clock and a power-reserve indicator between 7 and 8 o’clock.
The watch is fitted with a dual-curved sapphire crystal with inner anti-reflective coating and a stainless-steel bracelet secured by a folding clasp with push-button release. A screw-down crown, screw caseback, and 10-bar water resistance add practical daily-wear functionality.
Key Features
Grand Seiko Heritage Collection
Spring Drive Caliber 9R65
Approximately 72-hour power reserve
Silken sunray dial with champagne and silver tones
40.0 mm stainless-steel case
Dual-curved sapphire crystal with inner anti-reflective coating
Date display and power-reserve indicator
10-bar water resistance
Specifications
Specification | Details |
Brand | Grand Seiko |
Model / Reference | SBGA437 |
Collection / Series | Heritage Collection |
Movement | Spring Drive Caliber 9R65 |
Caliber | 9R65 |
Movement Type | Self-winding with manual-winding capability |
Case Material | Stainless steel |
Case Diameter | 40.0 mm |
Case Thickness | 12.3 mm |
Lug Width | 20 mm |
Crystal | Dual-curved sapphire with inner anti-reflective coating |
Dial Color | Silken sunray; champagne and silver tones |
Dial Details | Date display at 3 o’clock; power-reserve indicator between 7 and 8 o’clock |
Caseback | Screw caseback |
Bracelet / Strap | Stainless-steel bracelet |
Clasp / Buckle | Folding clasp with push-button release |
Water Resistance | 10 bar |
Functions | Hours, minutes, seconds, date, power-reserve indication |
Power Reserve | Approximately 72 hours |
Other | Magnetic resistance: 4,800 A/m; 30 jewels |
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