Seiko Cal. 6643 - 431

The Seiko 6643-431 represents an important milestone in Seiko's 1986 lineup. Powered by the 6643 caliber with 30j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-edc3f2313825]

Also known as: Helmet, Emperor

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1986

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