Seiko Cal. 4431 - 794

This Spring Drive model from 1977 features a 37mm PVD Black case. Powered by the 4431 caliber with 23j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-e6338c06d30e]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Green

Jewels

23j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1977

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