Jay,
A decent specimen, and certainly an interesting
type to acquire.
The reason for the restoration is not in doubt in my opinion, having been discerned by
Mommsen in 1859.
Because of their lower silver content, Antony's
legionary denarii were excluded from Trajan's recoinage of 107, and therefore
Trajan did not restore this
type.
But by the reign of
Marcus and
Verus, the silver content of the current
denarius had fallen to the point that it
had now become profitable to recoin Antony's
denarii.
Marcus and
Verus did so, and therefore
restored the coin too, picking at random one of the commoner legions for their restoration, since it was quite unnecessary to restore coins for several different legions, or for all of them!