Seiko Cal. 6640 - 839

The Seiko 6640-839 represents an important milestone in Seiko's 1965 lineup. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-71ad4174cdf5]

Also known as: Samurai, Helmet

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1965

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