Description
About Grand Seiko SBGE307
Grand Seiko Automatic Spring Drive 3-Day GMT Sport Collection
A Spring Drive GMT that conveys the majesty of the lion through its durable design
From the time of its first watch in 1960, Grand Seiko has used the lion, the so-called “king of beasts,” as a powerful symbol. Embodying the dignity of the regal creature, with all of its imposing and fierce presence, this model’s strong appearance recalls the animal’s powerful forelimbs, claws, and mane. The lugs, intended to evoke lion claws, have a bold and distinctive shape and appearance, and the case rests firmly yet comfortably on the wrist. The reddish-brown GMT hand quietly makes its presence known on the shining white dial. The watch has a high level of practicality befitting a sports model. This can be observed in the Lumibrite coating on the hands and indexes, which makes it easy to read at night, as well as the formidable water resistance of 20 bar. The watch is powered by the highly precise Spring Drive Caliber 9R66 with GMT, delivering a precision of ±15 seconds per month (equivalent to ±1 second per day).
About 9R Spring Drive
Spring Drive, one of the great innovations in modern watch making history, regulates a spring-driven movement with state-of-the-art electronic technology that functions without batteries or other external power source. Its sole power source is a mainspring, which drives a series of gears. A rotor, connected to the end of these gears, generates a small electrical charge that activates an electronic circuit and quartz oscillator. Its accuracy is unprecedented for a watch wound by a mainspring. The development of the 9R Spring Drive movement was possible only because Grand Seiko is one of the few manufacturers with expertise in both mechanical and electronic watches.
Caliber 9R66
Caliber 9R66 is an automatic Spring Drive movement with a 72-hour power reserve and an added GMT function.
Grand Seiko SBGE307 Features
A dial that evokes a lion’s mane glimmering in the rays of the sun
The dial design consists of a pattern that calls to mind the mane of a lion. The reddish-brown of the GMT hand contrasts with the shining white dial, ensuring easy legibility at a glance. With Lumibrite applied to its tip, the GMT hand can be read easily even in the dark.
Note: With GMT (Greenwich Mean Time) functionality, the local hour hand and the 24-hour hand can be set to different time zones, allowing the wearer to track the time in two locations at once.
Caliber 9R66
With a power reserve of 72 hours and accuracy of ±15 seconds per month, this was the first Spring Drive movement to incorporate a GMT mechanism.
- 30 jewels
- Allergy-safe metal
- 24-hour hand (dual time display function)
- Calendar-linked time difference adjustment function
- Date display
- Power reserve indicator
- Fixed high-intensity titanium bezel with 24-hour display
- Screw case back
- Screw-down crown
- Three-fold clasp with secure lock
Grand Seiko SBGE307 History
Prior to 1960, to challenge the status of Swiss watches and change the perception of Japanese watches, Daini Seikosha and Suwa began the discussion of a product line that can match the quality of Swiss watches under the suggestion of the parent company. At the time, Suwa Seikosha Co. was in charge of manufacturing men’s watches, so it was decided that Suwa would be producing the first Grand Seiko (GS).
The first Grand Seiko was released in 1960, it was based on Seiko’s previous high-end watch, CROWN. This Grand Seiko has a 25-jewel, manual-winding, 3180 caliber, and only 36,000 units were produced. This was also the first chronometer-grade watch manufactured in Japan, and it was based on Seiko’s own chronometer standard.
Design style
The design language of the Grand Seiko was set in 1967, with the creation of Grand Seiko 44GS. The 44GS set the ground for all future Grand Seiko with nine elements. These elements help improve the legibility of the watch under different situations, and create a sharp, crisp visual impression:
- Double width index at 12 o’clock
- Multi-faceted rectangular markers
- Highly polished bezel
- Highly polished planes and two-dimensional surface
- Half recessed crown
- Flat dial
- Multi-faceted hour and minute hands
- Curved side line
- Reverse slanted bezel wall and case side
- Dress style with simple but beautiful design
- Zaratsu polishing
source : wikipedia
