Seiko Cal. 6641 - 187

The Seiko 6641-187 represents an important milestone in Seiko's 1977 lineup. Powered by the 6641 caliber with 18j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-319a653ff999]

Also known as: UFO, Arnie

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1977

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