If memory serves the Serdica mint stopped issuing Provincial coinage with Gallienus so I assume the coin is an imperial issue. So the answer depends on how expansive you want to be. "A roman imperial issued minted at Serdicia" is probably the best. Thrace doesn't really come into it, unless you are describing a historical entity where Serdicia happened to be located
My
Papal States coin collection: https://diadumenian.com/Papal%20Sta...0States.html
Medieval coins collection: https://diadumenian.com/Congressofp...0Europe.html
Indian Rupee Collection: https://diadumenian.com/Congressofp...0Rupees.html
Minor world Silver: https://diadumenian.com/Congressofp...20coins.html
Papal States coin collection: https://diadumenian.com/Papal%20Sta...0States.html
Medieval coins collection: https://diadumenian.com/Congressofp...0Europe.html
Indian Rupee Collection: https://diadumenian.com/Congressofp...0Rupees.html
Minor world Silver: https://diadumenian.com/Congressofp...20coins.html




















