Seiko Cal. 5643 - 831

The 5643-831 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-21469c4543e7]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

12.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1971

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