Collection Folders Issued by The Vatican What is a Collection Folder? Since 1997 the Vatican City has issued collection folders containing a single issue or a series of stamps dealing with the same topic. The most famous is the "Pro Terremotati 1997" or Earthquake Folder which contains the 1990 Caritas overprinted souvenir sheet. Folder Stamps in Folder Price Please check back Browse our other collections Back to Home