here's a site to help identify Rosenthal porcelain
http://www.petziman.de/hallmarks/rosenthal.jpgClick lower right corner to get enlargment arrows, and you still need a magnifying glass (at least I do ! ) Kronach was one of the Rosenthal factories. I don't see that particular mark, tho'.
I earlier missed the pattern name of "Else". I went to replacements and it shows a blue/white pattern.I trust you've gone to the ultimate German marks expert, Chris-Simon Marshall, at:
http://www.porcelainmarksandmore.firmitas.deif you think the Else pattern may be yours, go to:
www.replacements.co m select China, R, Rosenthal continental, and the Else pattern. KB