Seiko Cal. 5631 - 660

The Seiko 5631-660 represents an important milestone in Seiko's 1975 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-e82b3ddbbe94]

Also known as: Emperor

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

43mm

Case Thickness

9.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1975

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