Seiko Cal. 6643 - 780

The Seiko 6643-780 represents an important milestone in Seiko's 1965 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-8bb75538551b]

Also known as: Rally, Crown

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1965

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