Seiko Cal. 5643 - 991

The Seiko 5643-991 represents an important milestone in Seiko's 1975 lineup. With its 19mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-e1559c25751c]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

38mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

White

Jewels

22j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1975

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