So, on a whim, I entered “Matthias Corvinus” into the search bar on Etsy. A coin appeared, from his reign, now mounted as a pendant.
First thought: Oh wow! St. Ladislas and the Virgin, yes there’s the raven and ring, yes, that’s a lot like what I remember. Perfect!
Second thought: Wow, I wonder how it ended up in Pennsylvania? It must have some fascinating stories to tell. And in such good condition (dates to 1460s-1490s).
Third thought: Alas, yes, the price is what I’d expect. Bummer.