Seiko Cal. 6643 - 523

The Seiko 6643-523 represents an important milestone in Seiko's 1965 lineup. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-dc8abccf3e9b]

Also known as: World Timer

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1965

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