Seiko Cal. 6638 - 912

The Seiko 6638-912 represents an important milestone in Seiko's 1979 lineup. Powered by the 6638 caliber with 34j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-67a5896828d7]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Champagne

Jewels

34j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1979

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