Seiko Cal. 5231 - 156

The Seiko 5231-156 represents an important milestone in Seiko's 1971 lineup. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-dea8ebd5f7a3]

Also known as: Bullhead, Arnie

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1971

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