I can't help much on the mark since I don't recognise it... and if it's a modern mark I won't be much help anyway. I have a few observations though.
The figural creature appears to have a mouthful of sharp fangs and has ears so I don't think it's any kind of eagle, nor a horse. There does seem to be a mane though, so 'wolf' (or mythical) would make the most sense.
It's frustrating when letters are grouped like this, since you can't reliably tell in what order the 'MMR' letters are intended to be read. The 'R' looks a little larger than the two 'M' letters and may be intended to be read first as 'RMM'.
It also looks like there are two smaller letters above the 'beast' at the top of the lozenge. Perhaps SA, SM or SH ?