The Grand Seiko Snowflake Buying Guide: Spring Drive, the Shinshu Dial, and What the Pre-Owned Market Actually Charges
The Grand Seiko Snowflake SBGA211 houses the Spring Drive — a mechanically powered watch regulated to ±1 second per day using a tri-synchro resonator that exists nowhere else in the industry. A dealer's complete guide to the movement, the Shinshu dial, what to check on pre-owned condition, and what full set is actually worth.