Can’t remember where it was documented now, but there were/are a number of different ermine punches, which includes the elaborate version seen on the reverse of the OP coin?
I've settled on an elaborate ermine mark. The coin below is acorn over ermine, but you can clearly see more than just the three tails as per the obverse for the underlying mark.
I think I speak for everyone that Peckris is a wealth of knowledge and very far from being a 'f-ing moron'.
It's unecessary to talk to people like that, so please don't.