Seiko Cal. 6642 - 851

The Seiko 6642-851 represents an important milestone in Seiko's 1978 lineup. Powered by the 6642 caliber with 20j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-421f48a09b5e]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1978

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