As with all the 'PB' range it is derived from Phil Barker's pair of books Armies of the Macedonian and Punic Wars and Armies and Enemies of Imperial Rome. PBC standing for Phil Barker Cavalry. This figure corresponds with illustration 37 in AMPW.
He is riding the ubiquitous PBH 65-217, the code '60-217' being stamped on the upper surface of the base in the usual fashion. This horse combines the original PBH 65 with its equivalent from the Armies and Enemies of Imperial Rome range - aside form the number on the base there is no difference between them.
I painted a unit of these a couple of years ago and they can be seen here.