Seiko Cal. 6643 - 602

The Seiko 6643-602 represents an important milestone in Seiko's 1970 lineup. The Coin-Edge bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-99abc16b4ec9]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1970

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