Seiko Cal. 5631 - 374

The Seiko 5631-374 represents an important milestone in Seiko's 1980 lineup. With its 21mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-9aa4eeb81f76]

Also known as: Baby Tuna

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

White

Jewels

28j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1980

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