Seiko Cal. 6690 - 991

This Spring Drive model from 1977 features a 41mm Hardlex-Coated Steel case. The Fixed bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ad842da8108b]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1977

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