SpecStudio
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Grand Seiko SBGA427
$5,800Stock unknown
Case
- Diameter
- 39mm
- Thickness
- 12.3mm
- Lug-to-lug
- 46.8mm
- Lug width
- 19mm
- Material
- Stainless Steel
- Water resistance
- 100m
Crystal & dial
- Crystal
- Sapphire
- AR coating
- Yes
Movement
- Caliber
- Grand Seiko 9R65
- Type
- Spring Drive
- Power reserve
- 72h
Grand Seiko
Grand Seiko's Spring Drive caliber combines a mechanical mainspring with an electronic regulator to achieve a perfectly smooth gliding seconds hand and accuracy of plus or minus 1 second per day. The Tri-synchro regulator uses the energy of the mainspring to generate electricity that powers the quartz oscillator and IC, eliminating the need for a battery. A 72-hour power reserve and 30 jewels make it one of the most technologically unique movements in horology.
Design language
- Case shape
- round
- Dial style
- textured
- Sub-dials
- 1
- Bezel
- fixed
- Bracelet
- lug-attached
- Hands
- dauphine
AI-detected from the product image
SBGA427 collection · 23 watches
2 colorways
The market
Market prices.
Retail$5,800
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Active listings2Across watch forums
Closed · 30d1Asking-price history
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Retail stock & market context
Grand Seiko on the secondhand market
+7.5%
2026 so far · +4.0% to +12.1% · 41 matched watches
In line with the index
Dress watches as a group: +10.7% · 210 matched watches
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The community take
Owners talk.
Owners widely praise the Grand Seiko SBGA427 for its exceptional finishing, particularly the "hall of mirrors" effect from diamond-cut indexes and extensive Zaratsu polishing on its 39mm case. The textured blue dial, evoking Arashiyama bamboo, is frequently described as amazing and glowing. The 9R65 Spring Drive movement is noted for its flawless timekeeping, and the tapered bracelet offers comfortable wear, fitting well even on smaller wrists. Some owners report scuffs on the highly polished surfaces and one noted a scratch on the case. The Grand Seiko SBGA427 is a technically strong and culturally inspired watch that owners find themselves wearing frequently.
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