Seiko Cal. 6640 - 325

This Hand-Winding model from 1991 features a 45mm Hardlex-Coated Steel case. It features a Navy dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-f3f23284f2e6]

Also known as: Navigator

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Navy

Jewels

20j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1991

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