I bought this very rough radiate "dupondius"-style Provincial of Moesia Inferior. I paid $17.50, which in hindsight was way too much, but oh well... It apparently features Apollo on the reverse, but I was unable to find an example on Wildwinds. The only Greek I can read on the back is "POLITON," which could indicate Nikopolis. Diam: 24mm Weight: 12.0g
The reverse shows Nemesis holding scales and cubit rule. If you don’t find it on Wildwinds, you could try acsearch or https://www.corpus-nummorum.eu/
Thanks! Nemesis explains why I couldn't find a matching Apollo... What happens when you take the seller's word for it
Yes, Nikopolis pros Istron, usually called by the Latin name Nicopolis ad Istrum. On the coin, I can read "...ΠΟΛΙΤΩΝ ΠΡΟC I" in the margin and "CΤΡ-ΟN" across the field, i.e. Νικοπολιτων προς Ιστρον ("of the Nikopolitans, [those] toward the Istros"). Istros was the Greek name for the Danube.
Just as a hint: The placement and abbreviation of the city name on these varies a lot. On many the ΠΡΟC I is more likely to survive than the first part of the name but is still enough to ID the city. Often the legend finishes in the field with letters stacked in many ways. Your "CΤΡ-ΟN" across the field would be plenty even if the encircling legend were totally gone. The most common city we see other than Nikopolis is Marcianopolis which does not have a ΠΡΟC allowing that possibility to be eliminated on poor coins. Later, under Gordian III, they got very 'creative' with the way they stacked the end of the legend. Below, as the end approached the cutter made ligate pairs out of ΩΝ and ΠΡ, did the o normally, placed a tiny c in exergue and stacked the ICTPON neatly in left field. I could not resist this coin for that reason alone. Paying too much is part of the hobby. What we need to avoid is making a habit out of paying too much and getting nothing worth having. Without the roughness, this would have been a very nice coin. I am very, very hard on surface roughness and avoid such coins more than those with wear.
