Grand Seiko Automatic Spring Drive 3-Day GMT
SBGE307G
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The Grand Seiko Automatic Spring Drive 3-Day GMT is a bold tribute to the brand’s enduring lion emblem, symbolising strength and precision. Its distinctive case design, with angular lugs inspired by a lion’s claws, exudes power while ensuring a comfortable fit on the wrist. A brilliant white dial sets the stage for the striking reddish-brown GMT hand, offering seamless dual-time functionality. The hands and indexes are coated with Lumibrite for optimal readability in low-light conditions. Designed for adventure, this robust timepiece boasts a formidable 20-bar water resistance, reinforcing its status as a true sports watch. At its core, the watch is driven by the Grand Seiko Spring Drive Calibre 9R66, renowned for its ±1-second-per-day accuracy and a 72-hour power reserve. The SBGE307G perfectly embodies Grand Seiko’s philosophy—uniting high precision with an imposing yet refined aesthetic.
Full Specification
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Brand Grand SeikoCollectionSportSeriesN/AModel NoSBGE307G
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MovementFeatures Date, GMT, Power Reserve IndicatorMovement Spring DriveCalibre 9R66CaseCase Size 44.5mmCase Thickness 14.9 mmCase Shape RoundCase Material TitaniumCase Back See-through Case BackLug Width 23 mmGlass Material Sapphire CrystalDialLuminosity On Hands, Hour Markers & BezelDial Colour WhiteIndexes BatonStrapStrap Material TitaniumStrap Colour SilverClasp Type Triple Folding Clasp With Push ButtonsBuckle/Clasp Material TitaniumOtherGender MenWater Resistance (M) 200Warranty Period 5 YearsCountry of Origin Japan
About the Grand Seiko Sport Collection
The Grand Seiko Sport Collection represents the brand's commitment to combining rugged durability with sophisticated design. Launched to meet the demands of active lifestyles, this collection incorporates advanced technology and robust construction to ensure reliability under the most challenging conditions. The idea behind the Sport Collection is to offer timepieces that can withstand physical rigour while maintaining the precision and elegance that Grand Seiko are renowned for.
Design
An elegant yet dynamic attitude and attention to detail define the Grand Seiko Sport watches. They come with robust cases, some characterised by smoother curves, while others have more angular construction. The use of materials, such as stainless steel, titanium, and ceramic known for their strength and lightweight properties, showcase the collection's performance-driven attitude.
Like any Grand Seiko watch, the dials are exceptionally designed, featuring interesting textures, colours, and configurations. Also as effective sport watches, the Grand Seiko Sport models offer maximum legibility, often by incorporating Lumibrite for enhanced visibility in low-light conditions. An ergonomic construction facilitating easy operation is conspicuous on bezels, crowns, and pushers. The overall design balances sportiness with elegance, making these watches suitable for both adventurous activities and sophisticated settings.
Iterations
The Grand Seiko Sport collection features a variety of sport watches, including dive watches, GMT, and chronographs. One standout timepiece is the highly-precise chronograph SBGC201, driven by the brand's Spring Drive movement, showcasing a unique arrangement of sub-dials. Additionally, the collection includes another impressive chronograph with a more robust and sporty look, the SBGC223. The GMT watches in this collection are also noteworthy for their combination of performance and aesthetics, designed to be versatile for everyday wear.

ABOUT THE MOVEMENT
Calibre 9R66 was released in 2006 as a GMT iteration of the popular 9R65, which is touted as the most standard 9R Spring Drive movement by Grand Seiko. It powers several GMT watches by the brand with an additional 24-hour hand and features additional functions like a power reserve indicator. It boasts 30 jewels, an automatic winding system, and approximately 72 hours of power reserve.

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- Brand Grand Seiko
- Reference 9R66
- Movement Spring Drive
- Display Analog
- Power Reserve Approx. 72 hours
- Jewels 30
- Frequency 32768 bph
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