I took another look at my coin and I don't see a
shield. Looks mostly like a rose to me, but that doesn't really fit with anything I found in
Price, though there are roses on
Medusa and
caduceus boss
shield coins. I'll have to look around some more to see if I can find something that might be a closer match.
edit: And I see that your coin also has a nice rose on it - I'll have to take another look at the two.