Sport Spring Drive GMT 40.5mm White
Ref. SBGA421
Overview
The Grand Seiko Sport Spring Drive GMT 40.5mm White (reference SBGA421) is a 40.5mm stainless steel with a spring drive movement and 200m of water resistance. It carries a white dial. On the secondary market it typically trades between $5,200 and $8,500.
Specifications
Price history
Confirmed secondary-market sales WristWorth has tracked for this reference.
About Grand Seiko
Grand Seiko was born in 1960 with a single ambition: create the world's best practical wristwatch. The result was a line of watches with finishing standards that rival anything from Switzerland — Zaratsu polishing creates distortion-free mirror surfaces that take years to master. The Spring Drive movement (1999) is unlike anything else in horology: a mechanical mainspring drives a glide wheel regulated by an integrated circuit, producing a sweep second hand with zero stutter. Grand Seiko dials are miniature landscapes — the Snowflake (SBGA211) textures recall powder snow on the mountains of Shinshu. Increasingly recognized by Western collectors, Grand Seiko offers extraordinary craft at prices well below comparably finished Swiss competitors.
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Frequently asked
What is the Grand Seiko Sport Spring Drive GMT 40.5mm White (SBGA421) worth?
On the secondary market the Grand Seiko Sport Spring Drive GMT 40.5mm White (reference SBGA421) typically trades between $5,200 and $8,500, with a midpoint around $6,500. Actual prices vary with condition, box/papers, and demand.
What movement powers the Grand Seiko Sport Spring Drive GMT 40.5mm White (SBGA421)?
The SBGA421 runs a spring drive movement, with roughly 72 hours of power reserve.
What are the case specs of the Grand Seiko Sport Spring Drive GMT 40.5mm White (SBGA421)?
The SBGA421 has a 40.5mm Stainless Steel case, water resistant to 200m, with a white dial.
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