Seiko Cal. 5640 - 945

The Seiko 5640-945 represents an important milestone in Seiko's 1979 lineup. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-8de02be93eb9]

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1979

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