I have a scan of Bavarian perfins (not mine)...this particular perfin isn't included, but I'll put the scan here anyway, for those who might be interested in seeing more Bavarian perfins:

The resource which probably answers this question is
Needham, John. 1990.
Catalog of Bavarian Perfins, The Perfins Club. [67 pages]
I've thought about it once or twice, but never pulled the trigger.
If this perfin originates in Würzburg, then one possible answer might be Julius-Maximilians-Universität, though I can't explain the R. Might be worth adding to Google search strings, though...it was likely the biggest thing going on in Würzburg at the time...