Home / Brands / Grand Seiko / Unclassified / SBGM257 Grand Seiko SBGM257 39.5mm · Stainless Steel · Caliber 9S66 · 30m
Grand Seiko Elegance Moondrop GMT SBGM255
Brand Grand Seiko Full reference SBGM257 Case diameter 39.5mm Case material Stainless Steel Water resistance 30m Movement Automatic Caliber 9S66 Power reserve 72 hours Functions / complications Central Seconds, Date, Second Time Zone Dial color Blue Bracelet / strap Leather Copy page link
Sources & record notes Displayed specifications follow the most complete source record. Other source records are retained below; conflicting values are not silently combined. The Watch Pages.
The Watch Pages · Grand Seiko SBGM257 Original collection: Not recorded
Technical Specifications / Date Added: November 5, 2025
Technical Specifications / Reference: SBGM257
Technical Specifications / Brand: Grand Seiko
Technical Specifications / Case Size: 39.5mm
Technical Specifications / Case Material: Stainless Steel
Technical Specifications / Dial Color: Blue
Technical Specifications / Movement: Automatic
Technical Specifications / Caliber: 9S66
Technical Specifications / Power Reserve: 72 hours
Technical Specifications / Water Resistance: 30m
Technical Specifications / Strap Material: Leather
Technical Specifications / Strap Color: Blue
Technical Specifications / Buckle Type: Folding Clasp
Technical Specifications / Style: Classic
Technical Specifications / Special Features: Open Case Back, Water Resistant
Technical Specifications / Complications: Central Seconds, Date, Second Time Zone Images are loaded from the cited external sources. Copyright remains with its holders; permission to reproduce locally has not been established.
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