Seiko Cal. 6643 - 537

The Seiko 6643-537 represents an important milestone in Seiko's 1985 lineup. Powered by the 6643 caliber with 34j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-867d03b38aad]

Also known as: Monster, Rally

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

34j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1985

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