Okay. I made a mistake (my first this year!). The legion I mentioned in my last post was Legio III Cyrenaica and not Legio XIII. I will need to do some research to see why it was part of MA's force and not Octavian's. Legion XIII was called the "Twin" legion
So far, I've found that Legio XIII was formed by Anthony in the East in preparation for his war against Octavian. This Antonian legion appears to have been disbanded, and its troops either retired or merged with Octavian’s legions following the latter's reformation of the armies after his victory at Actium.
I'll risk the wrath of Portunus (god of shipping) and post a coin I haven't actually received yet. This is Crawford 457/1, quite a scarce denarius struck in the Sicilian port of Lilybaeum on behalf of Caesar by the Sicilian proconsul Aulus Allienus. It was produced late in 47 BC, part of Caesar's preparation for the invasion of the Pompeian haven in Africa. The obverse depicts Venus (ho hum); the reverse is the only appearance on Roman coins of Trinacrus, a son of Poseidon and the eponymous deity of Sicily, which was sometimes known as Trinacria. Phil Davis