Seiko Cal. 7181 - 755

This Spring Drive model from 1966 features a 41mm Hardlex-Coated Steel case. With its 21mm lug width and 8.6mm profile, it sits comfortably on most wrists. [seikata-wm-0957d331f3ee]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1966

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