Grand Seiko Heritage, SBGA491

Description

Polishing the katana requires handcraft of tremendous skill and dexterity, and the same can be said of crafting Grand Seiko watches using the Zaratsu polishing method, particularly the 44GS case design, which established the Grand Seiko style in 1967.

The resilience and strength of shingane inspire the green dial of SBGA491, whose dial pattern evokes the unique texture in the variations of tamahagane, the jewel steel from which traditional katana swords are fashioned.

TECHNICAL DATA

EXTERIOR

Exterior: Stainless steel

Case back: See-through & Screw case back

Glass Material: Dual-curved sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

Case size: Diameter 40.0mm Lug-to-lug 46.2mm Thickness 12.5mm

Band width: 19mm

Clasp type: Three-fold clasp with push button release

MOVEMENT

Caliber no.: 9R65 Instructions

Movement Type: Spring Drive

Power reserve: Approx. 72 hours(3 days)

Accuracy: ±15 seconds per month (±1 second per day)

FUNCTION

Water resistance: 10 bar

Magnetic resistance: 4,800 A/m

Other details / Features:

Screw-down crown

30 jewels

Power reserve indicator