Seiko Cal. 3871 - 278

This Spring Drive model from 1985 features a 37mm PVD Black case. Powered by the 3871 caliber with 28j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-50aa767108da]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1985

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