OTO or Odero Terni Orlando was an Italian tractor manufacturer based in La Spezia, Italy.
It was founded in 1905, so it has been around for some time. However, the company's main focus was military equipment. After 1953 it changed its name to Oto Melara. They don't make tractors any more...
Photo of a red classic tractor: OTO C40 seen at a show in Italy.
1938 OM 2TM tractor
Photo of a OM 2TM tractor from 1938, seen in Italy.
Ed.: Note the steel wheels, the front ones ...
OTO C18 tractor
An old (1953) OTO C18 tractor, note the single front wheel.
OTO C18R3 seen at the Banbury Rally at Bloxham UK 2013
Marshall 302 tractor seen out on a roadrun a few years ago in Lincolnshire UK