Zagato #169 ... Enrico(?) ... we may have corresponded previously?
There may be more than one car bodied by "Zagato" (and "MECAT") with a body numbered "169". If your car was bodied by MECAT, apparently a subcontractor to Zagato and Abarth, then there is a chance we will learn the actual chassis number of your car one day? I have one page from the MECAT/Abarth/Zagato ledger that shows fifteen cars, nine of which were previously unidentified in my research listings. These cars are later than your car (if it is indeed by MECAT) but I have hope that additional information will turn up one day.
Best of luck!
John de Boer
The Italian Car Registry