This 26 mm coin does not say it is a Dupondius, but could it be.? Also, what determines a coin is a Dupondius?
As far as I know the denominations used in Rome are not applied in the provinces. https://www.wildwinds.com/coins/greece/moesia/markianopolis/i.html If you look at the bronzes from Septimius period, they used assarion and multiples. I don't think you will find the Rome system - as/dupondius/sestertius.........
It's a Provincial denomination, so the name isn't even known. The dupondius was an Imperial coin worth two asses. In the early Imperial period, it was made of brass (orichalcum) and weight around 13g, slightly heavier than the as, made from bronze. When new, the dupondius would have been yellowish and the as reddish. After a while, the emperor on the dupondius was depicted wearing a radiate crown to distinguish the coins from the asses. Empresses were never shown with radiate crowns, so it can be difficult or impossible to distinguish between the two denominations as the weights sometimes overlapped. ATB, Aidan.
Pentassaria from Marcianopolis had dual portraits and often a denominational mark E on the reverse. This coin is likely a tetrassarion, a local denomination that was valid in Marcianopolis and perhaps other nearby cities along the Black Sea coast, such as Dionysopolis, Tomis, Anchialus, and Odessus.
