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Hello. Can anyone help identify whose monogram this is?

It is a Russian princely crown and the initials seem to be 'MM'. The list of Russian princely families can be found in this list:

https://en.wikipedia.org/wiki/List_of_R ... families#M

Thanks for the answer, but there are definitely 2 Russian letters TT. Maybe someone can tell me the princely family that lived during the creation of this item with the initials TT?