Seiko Cal. 7131 - 748

This Spring Drive model from 1970 features a 43mm Hardlex-Coated Steel case. It features a Navy dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-7b382c885cca]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

27j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1970

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