Seiko Cal. 5631 - 816

The Seiko 5631-816 represents an important milestone in Seiko's 1975 lineup. With its 19mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-6088a1363e44]

Also known as: Golden Tuna

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

36mm

Case Thickness

9.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

27j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1975

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