Seiko Cal. 5681 - 864

This Solar model from 1981 features a 36mm Two-Tone case. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-fa3d3600bfb8]

Also known as: Monster, Bullhead

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1981

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