I may just be seeing something that's just not there, but the lower one looks similar to this to me:
![Image](http://www.925-1000.com/td/f/Crests/Furguason-1.jpg)
There are several similar crests to be found and I guess it is probably too worn for a positive ID.
Apologies to all if I'm deviating slightly off topic.
Trev.