Seiko Cal. 6638 - 423

The Seiko 6638-423 represents an important milestone in Seiko's 1974 lineup. With its 22mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-cf0ed00039b6]

Also known as: Rally, Silverwave

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

10.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1974

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