Hi,
Just my thoughts:
IMHO:
The two crossed keys (one for binding, one for loosening) is the symbol for St. Peter, gatekeeper of heaven in the Catholic religion. St. Peter is a very popular saint, hence the two keys are a common charge.
I am not familiar with a crown with five sections as depicted. The closest arms to that depicted is that of the Bishopric of York, England (AD 625).
Don't bother with the penny

(joke)
Cheers.