Seiko Cal. 6643 - 451

The Seiko 6643-451 represents an important milestone in Seiko's 1982 lineup. Powered by the 6643 caliber with 33j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-0a9231f1545e]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1982

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