Jugendstil beaker; Franz Rumwolf ?

[AG2012]

Art Nouveau beaker, 6 inches tall. ``FR`` should be Franz Rumwolf, Vienna.
Interestingly, a silver item with exactly the same ``FR`` mark evaluated by Dorotheum auction house was attributed to another maker.
Is it Franz Rumwolf?

[joris]

Your attribution to Rumwolf must surely be correct. All the other "FR" marks seem to have dots, sans-serif letters, notches in the borders, or entirely different shapes. The only other similar mark I see is from Franz Riessner, who was so much earlier that he must be excluded on stylistic grounds, as well as the presence of the Dianakopf mark.