Seiko Cal. 6138 - 171

This Spring Drive model from 1980 features a 40mm Titanium case. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-99d358407a72]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

White

Jewels

17j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1980

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