Seiko Cal. 5631 - 218

The Seiko 5631-218 represents an important milestone in Seiko's 1972 lineup. With its 21mm lug width and 14.1mm profile, it sits comfortably on most wrists. [seikata-wm-6baa2be2b0d0]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

160m

Dial Color

Burgundy

Jewels

19j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1972

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