I need help identifying this mark found on an .800 tea set. Thought it was German but since I found this mark hidden inside a lid today I'm not sure. There are five pieces but this seems to be the only one of these marks on the set. Other pieces are all marked 800 on bottom, with a number that I believe indicates the model number of the piece (ex: 5), then two tiny, tiny marks that have all been polished away and are impossible to make out.
This mark looks like a teapot or pitcher of some type with an m in it maybe? Any help appreciated!