My family came from Germany to the Galician province of Austria in 1784. In 1862 my great grandfather moved on to the Black Sea so my first thought was to see if either of your Mann or Ritthaler families did the same thing. My primary resource for Galician Germans is
http://www.galiziengermandescendants.org/ and their familybooks at
http://www.galiziengermandescendants.or ... ybooks.htm.
I found RITTHALERs in 23 villages in Galicia but none with the name George. Similarly, I found MANNs in 81 Galician villages and I even found one Anna Maria MANN but she was born in 1797. The GGD search engine for Galician Germans in their FamilyBooks can be found at
http://www.galiziengermandescendants.or ... yBooks.htm. Your family doesn't appear to connect to the Galician Germans but it's worth keeping in mind.
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Regards, Murray
BlackSeaGR Forum co-Administrator
Gauer Family Website