Seiko Cal. 5631 - 358

The Seiko 5631-358 represents an important milestone in Seiko's 1977 lineup. With its 18mm lug width and 8.3mm profile, it sits comfortably on most wrists. [seikata-wm-cafaa3acc0d0]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

39mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1977

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