Probus - 4th unspecified oriental mint

Attribution of Probus coins to the fourth (after Cyzicus, Antioch and Tripolis) unspecified oriental mint is based on the article by S. Estiot, "L’Empereur et l’usurpateur: un 4e atelier oriental sous Probus"; Studies in ancient coinage in honor of Anndrew Burnett, Spink, London, 2015.

These coins were all previously (mis)attributed by RIC V.2 to the Antioch mint.
Classification of busts is based on the fundamental work of Pierre BASTIEN, Le buste monétaire des empereurs romains.