Seiko Cal. 3866 - 581

The Seiko 3866-581 represents an important milestone in Seiko's 1969 lineup. Powered by the 3866 caliber with 28j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-ebb4fce3a89f]

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

28j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1969

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