Seiko Cal. 6331 - 156

The Seiko 6331-156 represents an important milestone in Seiko's 1979 lineup. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-e8a16dc4c113]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1979

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