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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe Grand Seiko SBGE305 “Hotaka Summer” is a 1,300-piece limited-edition Sport Collection GMT, released in 2024 to mark 20 years of the brand’s Caliber 9R Spring Drive. Its dark red dial draws on Grand Seiko’s stated inspiration of a summer sunrise over Japan’s Hotaka mountain range; inside is the automatic Spring Drive 9R66 with a 72-hour power reserve.
What is the Grand Seiko SBGE305?
The SBGE305 is a stainless-steel Sport Collection watch that combines Spring Drive timekeeping with a GMT function. Grand Seiko announced it on February 5, 2024, as one of two creations marking the 20th anniversary of Caliber 9R. The brand announced an edition of 1,300 pieces, with availability through Grand Seiko boutiques and select retail partners worldwide beginning in June 2024. Those are the release details, not confirmation of current stock.
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Grand Seiko describes the dial’s dark red color as inspired by a vivid summer sunrise illuminating the steep Hotaka mountain range in the Shinshu region. This is the brand’s design inspiration, rather than a claim that the dial reproduces a particular sunrise. The SBGE305 is also distinct from the Hotaka-inspired SBGC275 announced in April 2024: the SBGC275 is a chronograph with a different movement and case material.
SBGE305 specifications
| Specification | Grand Seiko’s published details |
|---|---|
| Reference | SBGE305 |
| Collection and edition | Sport Collection; 20th Anniversary Limited Edition of 1,300 pieces |
| Movement | Automatic Spring Drive Caliber 9R66; GMT function |
| Accuracy | ±1 second per day (±15 seconds per month) |
| Power reserve | 72 hours |
| Jewel count | 30 |
| Case and bracelet | Stainless steel |
| Case diameter | 40.5 mm |
| Case thickness | 14.7 mm |
| Bezel | Ceramic |
| Crystal | Dual-curved sapphire, with anti-reflective coating on the inner surface |
| Water resistance | 20 bar |
| Magnetic resistance | 4,800 A/m |
| Case back and crown | Screw-down |
| Clasp | Three-fold clasp with push-button release |
These specifications are from Grand Seiko’s US announcement, published February 5, 2024; the brand said specifications could change after publication. Read the official announcement.
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- See-through case back
- Date display
- Screw-down crown
- 40mm Diameter
- Weight 178.0 g
What movement is in the SBGE305, and how does its GMT work?
The SBGE305 uses Grand Seiko’s automatic Spring Drive Caliber 9R66. The manufacturer states an accuracy of ±1 second per day, or ±15 seconds per month, and a 72-hour power reserve. The movement has a GMT hand and an independently adjustable local hour hand.
For a time-zone change, the local hour hand can be set forward or backward while the watch continues running. That lets the wearer adjust local time without stopping the watch, while the GMT hand can continue to indicate another time zone. This describes the function Grand Seiko specifies; it does not establish a particular travel or accuracy test.
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- Three-fold clasp with push button release
- Dual-curved sapphire crystal
- Power reserve display on the back
- Power resrve Approx. 72 hours(3 days)
How much did the SBGE305 cost, and how many were made?
Grand Seiko announced a limited run of 1,300 watches. Its February 2024 US release listed an approximate recommended retail price of $6,200. That is the launch-era US price, not a current quote or estimate of resale value. The release said the watch would become available at Grand Seiko boutiques and select retail partners worldwide beginning in June 2024, but it does not establish present availability or pricing. Grand Seiko noted that price information was subject to change at the time of publication.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to distinguish the SBGE305 from the SBGC275
The Hotaka name and red-toned dial can cause confusion between two separate Grand Seiko releases. The SBGE305 is the 2024 anniversary Sport Collection GMT covered here, with Caliber 9R66, a stainless-steel case, and a 1,300-piece edition. The SBGC275, announced April 9, 2024, is a different Spring Drive Chronograph GMT. Its Caliber 9R96, titanium case, chronograph function, and 700-piece edition belong to that reference, not the SBGE305. Grand Seiko’s SBGC275 announcement identifies the separate model.
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- Featuring a Black Band, Silver-tone Case, Scratch Resistant Hardlex Crystal
- Box-shaped Hardlex crystal
- Second hand halt mechanism (Hacking)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
