The very first stamp is Vatican City Sc#9, Pope Pius XI, from 1929, $2 mint in 2008.
The revenues are not listed by Scott, and getting current values is difficult, except for completed auctions on
ebay. I hesitate to say that yours are common, because I'm no authority on them. That being said, they are the kinds of stamps that I find in small lots of Italian revenues that I pick up for a buck or three, here and there.
C.
C.