I was always under the impression that the saddles had a serial number?
Perhaps someone else can help answer this question?
I say this because I have a couple of saddles, some newer than others, and my older ones (pre-2000) that have that same type of inside tag, on the back it does say "Made in Italy" and then a serial (date code) follows to indicate the year of production.
I haven't seen a Saddle without a serial number, but that doesn't mean that it's fake either.