Well I actually found it myself, but I couldn't have done it without the help of people on the Heraldik site.
The beaker was first owned by Maria Williburg Frey, Reichsäbtissin von Rottenmünster (†1725)
Who was the Princess-Abbess of Rottenmünster now Rottweil.
http://commons.wikimedia.org/wiki/File: ... Wappen.jpgSo MWAZR stands for Maria Williburg Abbess at Rottenmünster.
This seems particularly appropriate as a friend refers to me as the Rottweiler of researchers.
Maurice