Seiko Cal. 3870 - 117

The Seiko 3870-117 represents an important milestone in Seiko's 1981 lineup. Powered by the 3870 caliber with 21j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-5a37d4e0d0ca]

Also known as: Monster, Bellmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1981

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