The first one came about when an Italian racing driver took his 4 days old Giulietta Sprint Veloce on the 1956 Mille Miglia and promptly crashed into a ravine during horrendous weather. Probably quite embarrassed by this event, he chose not to take it back to Alfa but approached Signor Zagato to replace the bodywork with lightweight aluminium in a slightly more aerodynamic form. Being significantly lighter than the standard cars, this particular “SVZ” started beating the factory cars and some other enterprising owners asked Zagato (and other similar shops) to convert their own cars, each one being tailored to the owner's wishes and therefore all are different in detail.
Not to be confused with the Alfa SZ which was an official model from the manufacturer, but these came later and will not get you into the Mille Miglia.
Would consider an interesting classic road car in part exchange – particularly anything Lotus.
Viewing by prior appointment, in Sussex area.