For what it's worth, I am copying some "distinguishing features" of Probus coins from the various mints from RIC Vol. V-2, but to be honest I cannot see many of them on the coins which are definitely attributed to this or that mint (e.g. because the legend combination and image and mintmarks were not struck by any other mint) here on wildwinds.
However, the information about the letters M and V is useful, because distinguishing between seemingly identical coins from Antioch and Siscia can be especially difficult.

Antioch
Cyzicus
Siscia
Serdica
Ticinum
Tripolis