Seiko Cal. 3866 - 520

The Seiko 3866-520 represents an important milestone in Seiko's 1981 lineup. With its 20mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-37e75147be58]

Also known as: Tuna, World Timer

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1981

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