Seiko Cal. 3870 - 613

The Seiko 3870-613 represents an important milestone in Seiko's 1979 lineup. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-9fae00efeab1]

Also known as: Monster, Helmet

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1979

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