Seiko Cal. 6690 - 638

The Seiko 6690-638 represents an important milestone in Seiko's 1976 lineup. With its 22mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-e0ad2168be8a]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Burgundy

Jewels

24j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1976

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