Seiko Cal. 6643 - 863

The Seiko 6643-863 represents an important milestone in Seiko's 1972 lineup. Powered by the 6643 caliber with 35j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-80a3f1740e06]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1972

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