Seiko Cal. 6640 - 628

The Seiko 6640-628 represents an important milestone in Seiko's 1972 lineup. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-691098533ce3]

Also known as: Sportsmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1972

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