Here is the escutcheon of Angela Burdett-Coutts, 1st Baroness Burdett-Coutts, with baroness crown, before she was married.

Here is the blazon:
Azure party per cross, dexter chief, triangle embattled, four buckles, azure pheon, stag cabossed, sinister chief, two bars or, six martlets closed, sinister base, triangle embattled, four buckles, azure pheon, stag cabossed, dexter base, two bars or, six martlets closed.