Seiko Cal. 6188 - 438

This Spring Drive model from 1971 features a 35mm Titanium case. With its 20mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-373a4cb53919]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1971

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