Seiko Cal. 3881 - 920

The Seiko 3881-920 represents an important milestone in Seiko's 1972 lineup. Powered by the 3881 caliber with 33j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-d8fbd6a36adf]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

33j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1972

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