Seiko Cal. 5642 - 640

The Seiko 5642-640 represents an important milestone in Seiko's 1977 lineup. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-5ce918158fa4]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

13.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

32j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1977

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