Seiko Cal. 6638 - 831

The 6638-831 is a sought-after Solar piece from Seiko's golden era. Powered by the 6638 caliber with 34j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-551819ac5e91]

Also known as: World Timer

Specifications

Movement

Solar

Case Material

Titanium

Case Width

36mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

34j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1987

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