Seiko Cal. 5687 - 675

This Spring Drive model from 1981 features a 46mm Hardlex-Coated Steel case. With its 21mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-8ef80fec719c]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1981

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