Seiko Cal. 6638 - 722

The Seiko 6638-722 represents an important milestone in Seiko's 1981 lineup. Powered by the 6638 caliber with 26j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-b0e6f528a259]

Also known as: Silverwave, World Timer

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

46mm

Case Thickness

8.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

White

Jewels

26j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1981

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