Seiko Cal. 5631 - 945

The Seiko 5631-945 represents an important milestone in Seiko's 1979 lineup. The Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-8b40793571c5]

Also known as: Tuna, Emperor

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Cream

Jewels

23j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1979

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