Seiko Cal. 6631 - 142

This Hand-Winding model from 1968 features a 35mm Two-Tone case. Powered by the 6631 caliber with 30j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-045d3f1aa86c]

Also known as: Arnie

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1968

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