The product described is a Roman Imperial Valerian I AR Antoninianus coin minted in Viminacium in 254-256 AD. This silver coin has a fineness of 0.6 and a denomination of Antoninianus. It is from the historical period of Roman Imperial rule and features Valerian I as the ruler. The certification of the coin is uncertain, and it has been cleaned. The coin was manufactured in Serbia during the ancient Roman era.