Seiko Cal. 6690 - 894

This Spring Drive model from 1979 features a 36mm Hardlex-Coated Steel case. It features a Navy dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-7590e7f00f8c]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

25j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1979

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