Seiko Cal. 6643 - 143

The Seiko 6643-143 represents an important milestone in Seiko's 1968 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-be3092456c1b]

Also known as: Sumo, Shogun

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

White

Jewels

32j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1968

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