etc4 looks like Fiat Gilco 1100 Sport MM - 1949
Very good!
This is indeed a Gilco Fiat 1100 S, that raced the Mille Miglia in 1951, 1954 and 1955 in its siluro configuration designed by Sergio Mantovani and built by the Bartolomeo Barbero's Carrozzeria (CBC).
The car was later prepared in this barchetta configuration for the 1956 Mille Miglia. The car was first registered in 1949 and technically speaking it's not a Gilco, since Gilco was a tubular chassis-builder (thanks als15 for reminding me that).
#1 - Fortunati Sport 1950
Carnut #2 - Leone Fiat 1100 Sport
als15#3 - Minardi MG75 1948
als15#4 - Gilco 1100 S Mantovani 1956
pnegyesi#5 - Nardi-Danese Baby Sport 750
Carnut #6 - Minutolo Fiat 1100 Sport
als15#8 - Vendrame fiat 500a sport 1938
Carnut & pnegyesi#9 - Ortolani 750 Sport 1949
pnegyesiBonus- CFM 750 Sport
als15