Seiko Cal. 5631 - 448

The 5631-448 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-6ae2bf502d63]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

26j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1972

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