Seiko Cal. 5660 - 750

This Spring Drive model from 1976 features a 42mm Hardlex-Coated Steel case. It features a Silver dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-4407755378d1]

Also known as: Tuna, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

14.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Silver

Jewels

27j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1976

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