Seiko Cal. 5643 - 820

The Seiko 5643-820 represents an important milestone in Seiko's 1972 lineup. With its 21mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-69438c58fdf0]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1972

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