Seiko Cal. 6640 - 327

The Seiko 6640-327 represents an important milestone in Seiko's 1967 lineup. With its 21mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-c0121ede7c6e]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1967

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