The German word, "Ausfuehrung", literally translates in English to the word "execution".  The Ausfuehrung numbers represent different decorative versions executed by Loetz.  Some "A-Z" named decors as well as Titania have Ausfuehrung numbers also assigned to them.  In these instances, the name of the decor and the Ausf number represent the same decorative execution. For example, "Chalcedon" is the same as "Ausf 109" and "Argentan" is the same as "Ausf 111".  The Ausf numbering system is most helpful when there are several different "executions" of the same decor such as "Perl Glass".