Seiko Cal. 0731 - 631

This Spring Drive model from 1968 features a 46mm Two-Tone case. The Coin-Edge bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-5c9e2ab3b799]

Also known as: Arnie, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Green

Jewels

21j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1968

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