Seiko Cal. 6638 - 191

The 6638-191 is a sought-after Quartz piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-0d3b79da16ee]

Also known as: Monster, UFO

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1981

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