Seiko Cal. 6639 - 912

The Seiko 6639-912 represents an important milestone in Seiko's 1990 lineup. With its 18mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-dceea5c87b80]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1990

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