Seiko Cal. 6640 - 225

The Seiko 6640-225 represents an important milestone in Seiko's 1974 lineup. With its 21mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-8d1db89f1247]

Also known as: Helmet, UFO

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

130m

Dial Color

White

Jewels

24j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1974

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