Seiko Cal. 3817 - 644

The Seiko 3817-644 represents an important milestone in Seiko's 1977 lineup. Powered by the 3817 caliber with 22j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-826f56e2ac19]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1977

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