Seiko Cal. 6638 - 427

Released in 1965, the Cal. 6638 with design code 427 was part of Seiko's domestic market collection. With its 18mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-d8ed87eb7b67]

Also known as: Rally, World Timer

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Cream

Jewels

22j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1965

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