Hi Clint
In Italy all these MF.11 were known as MF.14, which must be their way of confusing it with the French Military Type XIV. However that mistake was made already back in the "good-old-days"....
It was mostly licence built and to give the seller some credit when he says B-5, the FIAT owned Societa Italiana Aviazione (SIA) called them SIA 5b, so we can easily see where the seller went astray....
Cheers
Stig