Pair of antique plaster cast circular portraits

Hi All,
As always I'm after a bit if information on these curios I picked up the other day.
They appear to be dated 1920, and look like plaster portraits mounted on black wood. Say cast and mounted on one, and just cast on the other, along with initial R.C.M (not sure about C could be O or E).
I wonder firstly if they are of anyone famous, also could RCM be royal college of music? And anybody any idea who might have made them? Would you say good or bad quality?
Many thanks
Paul.

 

Bottom one looks like Beethoven.

 

Houseful nailed Beethoven. The other is likely to be another famous composer.

 

Mozart?

 

Ha, yes I think you’re both right looking at the above comparisons, thanks. Though my ‘mozart’ looks a bit chubbier. Would we agree RCM is the initial and likely to be royal college of music rather than sculptor initial?
Maybe I’ll contact the RCM as they have a museum so might know if they ever belonged there.
Btw, I forgot to say the are roughly same size and about 8” diameter.

 

There’s one on EBay, I can’t link with this iPad but it says 1950s Mozart plaster plaque, and it does look very similar to yours.

 

It does a bit, mine mote detailed though. The one on eBay is a bit strange with so many ink dates.
Mine a bit like below too to be fair: (this one a master sculptur)