Seiko Cal. 6657 - 157

This Spring Drive model from 1979 features a 40mm Titanium case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-7dc54cdc2db1]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Cream

Jewels

26j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1979

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