Where the Final Assembly took place can be a funny thing. My 1969 Alfa Duetto Spyder for example, should never have existed in North America. It couldn't meet the SPICA standards for polution in Cali. So it was basically sidelined in 1969 until the SPICA Fuel Injection of the 1970 models met the standard for entry into the US. This was the case with virtually every car made outside of Canada or the US in 1969 that did not meet the emerging pollution standards.

Then, late in the year, some bright Alfa exec in NYC realized that an auto-trade pact existed between Canada and the US that year. (remember all those Camaros that we built in Oshawa?). Regardless, he ordered 7 vehicles as mine canaries and had them sent to Montreal where the twin Webers were installed. Ergo, final assembly in Canada! Two sold in Canada, five went to the US under the auto trade pact agreement, since under the agreement, vehicles built in Canada (again with the Camaros!), were exempt from the pollution laws. All nice and legal - but should normally never have existed.

I think the key to proving where the top was from is to prove that it landed in Maryland as is the case with virtually every XF in North America!