Seiko Cal. 6643 - 303

The Seiko 6643-303 represents an important milestone in Seiko's 1966 lineup. Powered by the 6643 caliber with 26j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-4ddad90124ad]

Also known as: UFO

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1966

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