Seiko Cal. 6631 - 635

The Seiko 6631-635 represents an important milestone in Seiko's 1980 lineup. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-dfe99829672a]

Also known as: Turtle

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

41mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Burgundy

Jewels

18j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1980

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