Seiko Cal. 6331 - 936

The Seiko 6331-936 represents an important milestone in Seiko's 1971 lineup. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-390ee473da05]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

Cream

Jewels

30j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1971

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