Seiko Cal. 6638 - 585

The Seiko 6638-585 represents an important milestone in Seiko's 1976 lineup. With its 20mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-cf916d3565cf]

Also known as: Tuna, Silverwave

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1976

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