Seiko Cal. 5680 - 940

This Spring Drive model from 1979 features a 41mm Stainless Steel case. With its 19mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-03ab65623fb9]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1979

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