It's one of the "cherryblossom marks"....made up of a series of the letter "M"...for the Morimuras....Gothborg dot com will give you more information.....early 20th century I think....the mark is blurry maybe another piece has a clearer mark?

Thank you Linda!

Don't quote me but I always thought these were called hot chocolate pots. Not that this person is correct but here is your pot. your pot on etsy

Thank you Richard, that is what my mom actually called… my friend thought it was a tea or coffee set.