Seiko Cal. 3851 - 731

This Spring Drive model from 1975 features a 44mm PVD Black case. Powered by the 3851 caliber with 32j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-ae6d218dee65]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1975

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