This car was also puzzled in 2012 and 2016 by Carnut:
NEH 2152 OSCA 1050 S Coupe Corbetta - 1964
and
NEH 4838 OSCA 1050S Touring coupe
The coupe was probably built by Corbetta. As stated in NEH 4838, multiple online sources claim the builder as Touring.
I can see how a search of solved puzzles would miss this one. Maybe when the puzzles are merged, it should be called:
1964 OSCA 1050 S Coupe by Corbetta or Touring