Seiko Cal. 6643 - 720

Released in 1966, the Cal. 6643 with design code 720 was part of Seiko's domestic market collection. Powered by the 6643 caliber with 17j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-997264d98314]

Also known as: UFO, Emperor

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

42mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Cream

Jewels

17j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1966

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