The Mitterteich company was founded in 1882 as The Mosanic Pottery Max Emanuel & Co, in Mitterteich. Early pieces are marked Austria. I cannot discover the history behind Mitterteich now being in Germany. (Mitterteich is about 6 miles from the Czech border) It is possibly some of the border changes that happened after WWI.
1918 The Mosanic Pottery Max Emanuel & Co converted to Porcelain Facctory Mitterteich. It produced household porcelain, coffee and tea sets, gift articles. The factory is still in operation today and has a Web site.
There are different marks for different time periods.