Researching registrations of Fiat 850's in the Nederlands suddenly an El Sabry showed up. Never heard of it so immediately start looking on the internet. It turns out to be a kind of buggy, based on the technology of the Fiat 850 and built by G.A.M.C. in San Remo. It all ended after 80 cars were built.
In 2016 number 582 was put to auction in the States (by Mecum) and I was able to get some extra photos: