Seiko Cal. 5644 - 636

The Seiko 5644-636 represents an important milestone in Seiko's 1972 lineup. With its 19mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-1f1436f17afc]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1972

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