I think I found out what it is: The word is spelled Bareuther
The industrials Max Jena (Selb, Bavaria), Ernst Ploß (Asch, Bohemia) and Oskar Bareuther (Haslau, Bohemia) took over and after modernizations started to slowly but surely increase quality and output. Max Jena left the company in 1887, resulting in a rename of the company. The next years were relatively eventless and the workforce count for 1913 still showed a number of 600 employees, but by 1930 the number had increased to 700, only to drop back down to 650 in 1937. The company itself was one of the top players in the porcelain industry, setting standards in quality assurance and investment strategies, a point that should pay off later as it helped the company recover after the war.
This addition Bareuther & Co. Bavaria was created between 1937 through 1945 based on that stamp. Interesting to finally have an idea about this set. Still not sure about the worth although the previous poster I think is close. Looks like an herloom to be handed down.