Seiko Cal. 6690 - 831

The Seiko 6690-831 represents an important milestone in Seiko's 1977 lineup. It features a Navy dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-0bcc046b8a52]

Also known as: Shogun, Silverwave

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1977

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