Seiko Cal. 6640 - 834

The Seiko 6640-834 represents an important milestone in Seiko's 1982 lineup. With its 21mm lug width and 12.7mm profile, it sits comfortably on most wrists. [seikata-wm-d61af0190416]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1982

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