Seiko Cal. 3813 - 638

The Seiko 3813-638 represents an important milestone in Seiko's 1977 lineup. With its 20mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-e5f1fb63cd01]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1977

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