Seiko Cal. 6636 - 831

The Seiko 6636-831 represents an important milestone in Seiko's 1967 lineup. Powered by the 6636 caliber with 28j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-52afb378b797]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1967

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