Great coin and beautiful portrait. The Providentia Deorum reverse is one that I have yet to get for any emperor. I wonder what the scene depicts: Sol "blessing" military standards?
It's a scene of Fides receiving the "blessing" from Sol Invictus, but I think that the undertext here is how the legions are in the blessings of the emperor. I also think that it shows just how strong Aurelian's ideology of putting Sol at the center of the religious aspect of his power was, and how that got preserved and perpetuated by his "heirs" to the purple. Serdica is also a very interesting mint for this period, it seems this type was a favorite of the mint, fitting if we consider that Aurelian was possibly born there and the city became the capital of his new Dacia province in 271.
As I said before, I agree it is Siscia not Ticinum. This coin below from acsearch is of very similar style.
(foregot to past in the link in the previous post) https://www.acsearch.info/search.html?id=441266 Coins from Siscia have a very distinctive style.
Whilst it might seem that I only collect Lugdunum I also have a passing interest in the other mints and am quite familiar with the Siscia style which is indeed quite distinctive. Obv:– IMP C M CLA TACITVS AVG, Radiate, draped and cuirassed bust right Rev:– AEQVITAS AVG, Aequitas standing left with scales and cornucopia Minted in Siscia (//P) Emission 1 Officina 1. Reference(s) – Cohen 10. LV 1660 (14 examples 1998-2011). RIC 181 Bust type C var (RIC 181 is _|P). RIC temp #3605 (47 examples cited)