Seiko Cal. 3841 - 187

The Seiko 3841-187 represents an important milestone in Seiko's 1970 lineup. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-411b7cf33cb1]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

8.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

18j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1970

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