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| Brand: | Grand Seiko |
|---|---|
| Family: | Spring Drive |
| Reference: | SBGA289 |
| Name: | Spring Drive White Gold / Snowflake / Strap |
| Produced: | 2017 |
| Limited: | No |
| Material: | White gold |
|---|---|
| Glass: | Sapphire |
| Back: | Open |
| Shape: | Round |
| Diameter: | 39.00 mm |
| Height: | 12.50 mm |
| W/R: | 100.00 m |
| Nickname: | Snowflake |
|---|---|
| Color: | White |
| Finish: | Matte |
| Indexes: | Stick / Dot |
| Hands: | Dauphine |
The Grand Seiko SBGA289 was introduced in 2017, when Grand Seiko became a brand of its own rather than a collection within the larger Seiko family. It features a white gold case and a crocodile strap. It's Spring Drive caliber 9R15 can be seen through the case back.
The Caliber 9R15 is a movement that is specially adjusted to a higher precision than the most standard 9R spring drive movement, the Caliber 9R65.
While the caliber 9R65 has an average monthly difference of ? 15 seconds (equivalent to a daily difference of ? 1 second), the caliber 9R15 has a difference of ? 10 seconds (equivalent to a daily difference of ? 0.5 seconds).
The difference between the two movements lies in the quartz crystal that sends an accurate electrical signal.
All 9R spring drives use crystal units with stable accuracy, but only the crystals that exhibit particularly excellent performance are selected and installed in the ?caliber 9R15?.
As a proof of the special adjustment accuracy, the rotor weight is made of 18K yellow gold and can be seen from the back cover of the see-through specification.
| Type: | Spring Drive |
|---|---|
| Brand: | Seiko |
| Caliber: | 9R15 |
| Base: | Grand Seiko9R65 |
| Display: | Analog |
| Jewels: | 30 |
| Reserve: | 192 h |
| Time: | Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) |
| Date: | Date |
| Additionals: | Power Reserve Indicator |
More watches using the Seiko 9R15 caliber