Just to give an example and this is for the real enthusiasts, I have attached 3 different cards of the same photograph but these are the Base "M" large cards, both are known as base type "B", (there are 4 recognized sub types of the Base "M") and just to complicate it even more I am sure that there are sub bases, of sub base B. At first I thought there where reaching double figures but I think most are just worn printers. This card is for now the only card I have found to have more than one sub sub base.