Seiko Cal. 5643 - 686

This Spring Drive model from 1978 features a 39mm Hardlex-Coated Steel case. With its 20mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-e98c7b14d266]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1978

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