Seiko Cal. 0731 - 397

The Seiko 0731-397 represents an important milestone in Seiko's 1985 lineup. With its 20mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-5daaa72e668f]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Champagne

Jewels

18j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1985

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