Here is what I know about the difference in the numbers and I could be way off. When Fusi compiled the numbers he used the Alfa archives from the books that were compiled at the end of the assembly line. Amico and Tabucchi also went through the records and were again from what I know, very meticulous about the numbers. This is reflected in the book when you look at each section of cars produced. I can only imagine the hours spent going through the books. Even then there was a supplement published to go with the double book set to clarify some issues. Most of us have been around long enough that we used Fusi's numbers as the official bible if you will until the A&T book set came out. The numbers on my website were taken from the Fusi book...Alfa Romeo dal 1910
Thank you for mentioning my register. The registers are now approaching about 1000 cars listed. I add cars about once every two weeks or less to the registers. Currently working on correspondence with a couple of people about some of the more rare cars on the registers.
Some were lists from sources given to me, my own research for cars and from websites where cars have been for sale. What you see is what was either listed in the ads, given by the owners or person selling the vehicles. I never claim to be 100%, I am only documenting what exists. I do not have all that are out there as it is hard to get chassis numbers. It is a labor of love. It would be nice to get back my monthly expenditure.
I am hoping to be able to keep the website/registers going for a little longer.
If there was two requests I could have fulfilled, it would be to get the Bertone body numbers and PF trunk floor numbers from the cars listed. Also having updates on the cars. Some change hands 3 or more owners before it resurfaces and that history is lost. Once is it gone, it is almost impossible to retrieve. That is why you see so many cars with history of "previous owners: unknown" listed. If the history was known, it could be used to have the car ASI certified in Italy for a gold plate.
Thank you to all who have contributed, found cars for me and corresponded about your car.