Seiko Cal. 6638 - 698

The 6638-698 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6638 caliber with 29j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-d828d24a2ba0]

Also known as: Sumo, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

12.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Green

Jewels

29j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1989

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