Claudius Gothicus Antoninianus: Rome or Antioch?

Curtis Clay posted on the discussion board: A. Markl, Mints and Issues of Claudius Gothicus (in German), Num. Zeitschrift 16, 1884, notes that Antioch and Rome share the same officina marks and some of the same rev. types, but the marked coins are easily separated, since Antioch always has obv. leg. IMP C CLAVDIVS AVG and officina letter IN EXERGUE, whereas Rome-mint coins with letters in exergue only began in Issue 3 with shortened obv. leg. IMP CLAVDIVS AVG.

Moreover Rome and only Rome usually writes IIIIIP for IMP in obv. leg. (your coin has more IVI for the M, which Markl says also occurs at Antioch).

Finally Antioch coins "are usually on nicely rounded flans and are struck in better billon than the antoniniani of other mints, and are also found more often with an intact silver coating."

Markl, a retired army officer, was a specialist collector of Claudius and the first man to clearly distinguish the different mints of the antoniniani and to put the production of each mint in approximate chronological order.