Seiko Cal. 6645 - 639

The Seiko 6645-639 represents an important milestone in Seiko's 1967 lineup. With its 19mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-3bb522f3d822]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1967

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