This blog is now the official home of these cars. Here in another one living in France (like most of these cars, if you exclude Germany) which looks quite good.
Differently from the other OSI 20M TS published here, this car has a little boss on the bonnet which could maybe hide an engine bigger than the one installed by the factory, however the seller says nothing about it but that the engine is original, nor he has published any photo of the engine bay.
The seller says however that upholstery has been professionally redone as well as the brakes; the exhaust is new and the fuel tank has been cleaned. The car has also a set of wheels clearly larger than stock, but they look good anyway. Find it for sale at €17,000 (today $23,000) here in Laragne-Montéglin, France.