Seiko Cal. 3887 - 139

The Seiko 3887-139 represents an important milestone in Seiko's 1980 lineup. Powered by the 3887 caliber with 33j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-761b292368c3]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1980

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