Seiko Cal. 6638 - 423

The Seiko 6638-423 represents an important milestone in Seiko's 1978 lineup. With its 20mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-3cebcb89b734]

Also known as: Panda

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

9.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Cream

Jewels

26j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1978

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