The Winter 2009 issue of Double Gun Journal has an article called "The Italian 'Guild' Action Over and Under". The author points out that there have been a lot of inexpensive Italian OU's built on essentially the same action. Guns imported by Kassnar are a good example. But somewhere on that gun there should be a name, perhaps only of the importer. And if there's no maker's name, there may be a maker's trademark hidden among the proofmarks.