What are the case specifications of the Grand Seiko Heritage?

The Grand Seiko Heritage features a 40mm diameter, 12.3mm thick, Steel case with a sapphire crystal crystal.

What is the water resistance of the Grand Seiko Heritage?

The Grand Seiko Heritage has a water resistance rating of 100m (swimming).

What movement does the Grand Seiko Heritage use?

The Grand Seiko Heritage is powered by a Spring Drive, caliber 9R65, 72h power reserve.

Grand Seiko Heritage

Spring DriveSteel

Ref. SBGA439

Collection: HeritageCase size: 40mmMovement: 9R65

The Grand Seiko Heritage, reference SBGA439, is a Spring Drive watch with a steel case measuring 40 mm in diameter. Spring Drive calibre 9R65 has 30 jewels and approximately 72 hours of power reserve. Case thickness is 12.3 mm, with a lug-to-lug measurement of 46.6 mm; water resistance is rated to 100 metres. The dial is covered by a dual-curved sapphire crystal with an inner anti-reflective coating. This model has a date display and a power reserve indicator. The steel bracelet closes with a folding clasp with push button release. A moonlit night sky inspires the blue dial, which has faceted hands and markers.

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Last updated 9 Oct 2026Suggest a correction