Seiko Cal. 6638 - 826

The Seiko 6638-826 represents an important milestone in Seiko's 1973 lineup. Powered by the 6638 caliber with 22j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-40fb227263c1]

Also known as: Sumo, Navigator

Specifications

Movement

Solar

Case Material

Titanium

Case Width

38mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1973

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