Seiko Cal. 5631 - 147

This Spring Drive model from 1979 features a 43mm PVD Black case. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-19db8bb11866]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

36j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1979

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