These are the correct stub numbers that identify them as original Innocenti factory fitted barrels, however, these idicate something (disputed) like batch, casting or revision versions. As such, all originals will have them but it doesn't identify the model that they come from, that is identified through the top fin having semi-circle notches taken out of it or not. TV200 have no notches, SX and GP both have the notches and the same part number.
Lots of aftermarket barrels follow the no notch / notch identification but they do not have the number stub identification that show yours as original Innocenti factory fitted barrels.
Only way to identify yours further is to look at top fin for model, then it is down to porting spec to identify further.
Adam

