Date and makers marks on antique teapot help please!!

Can someone please help with identifying this date mark? And possibly the smudgy mark above it? It is a silver tea pot. Thanks for any help, it is doing my head in.
teapot.JPG

I can’t read what it says above the “M” but, from the pitted state, I suspect that it is electroplated rather than silver. There certainly doesn’t seem to be a hallmark there.