Ferret,
I wouldn't be too concerned about cylinder markings, what matters is the maker's mark on the gun itself. Pietta's mark is usually on the side of the barrel, Uberti's is usually on the underside of the barrel, underneath the loading lever. At least thats where I've seen them on the guns I've held. Maybe the older ones have their stamp somewhere else but the newer ones are definitely stamped like described above. My 1849 pocket from Uberti (Taylor Arms) wasn't even stamped Uberti!, neither was the second one that was ordered. They must be doing things a little differently now-a-days, getting lazy or something. The gunsmith from Taylor Arms asked me if I wanted to send it back and exchange it for one with a stamp but I declined, no big deal to me. Besides, I bet he would have found out that all of the newer 1849's don't have the Uberti name stamped on them, just "Black Powder Only Made in Italy" stamped on the underside of the barrel. If anyone has more info on this please post it, seems a little odd to me.