The Fiat 850 Coupe proved to be a fantastic success for the factory and it did not take long for Abarth to come up with something hotter for those who thought that 47 BHP of the standard model were not good enough.
In 1966 the 1000 OT was launched, with the same 1000 cc engine as in the Fiat 600
derived Abarth versions. In this shape the car had 70 BHP, allowing about 160 kph. The standard version could make 145 on a good day, whereby the rev-counter went into the red. Also hotter versions OTS and OTR were available, but the OT was the only one really suitable for normal use.
Later on OT 1300
, 1600 and the ferocious 2000 OT used the same bodywork, but were never offered for street use. As is normally the case with Abarth no reliable production figures are known, but the car was produced during three years until 1969.