Seiko Cal. 3881 - 660

This Automatic model from 1975 features a 45mm Hardlex-Coated Steel case. Powered by the 3881 caliber with 28j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-8dfcebff4bdb]

Also known as: Helmet, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1975

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