Seiko Cal. 3851 - 643

This Quartz model from 1978 features a 45mm PVD Black case. Powered by the 3851 caliber with 21j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-e50b6ac11be5]

Also known as: Monster, Sumo

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

45mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Green

Jewels

21j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1978

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