I will attach dealer photos because, frankly, they are better than anything I have tried. This coin type is from the earliest issues of Antioch for Claudius II. Obverse: IMP C MAVR CLAVDIVS AVG Reverse: DIANAE VICTR The very first scarce issue includes PF in the obverse legend and is only known for limited types and examples. This is from the equally scarce second phase (no PF). There are no recorded examples of this reverse type for this early issue, although its existence fits within the known issue types for early Claudius at Antioch. The obverse bust is very much the dearly departed Gallienus, so the die cutters did not yet know how to portray the new emperor.
That's a nice and interesting example. Congrats. It is similar to RIC 205 Claudius II Gothicus Silvered AE Antoninianus. Antioch mint. IMP C CLAVDIVS AVG, radiate, draped, cuirassed bust right / DIANAE VICTR, Diana standing right, holding bow and reaching for arrow from quiver on her back, stag to right, H in ex. Cohen 67; struck 268-270 AD. The difference is the obverse legend on yours reads "IMP CN AVR Claudius AVG.
I am struggling to obtain a better resolution photograph so I do apologize. This is the second known example of this coin. It is a obverse die match as far as I can tell but not a reverse match. It was acquired last year at the auction of part of Gysen's magnificent collection.
That is a stunning coin. When dealing with the very rare we are extremely fortunate to find a coin in such good condition with all detail perfectly clear. I am always glad when such a coin finds a home where it can be appreciated rather than just someone who wants a nice Claudius for the one-per-ruler set. I am not a Claudius specialist and have no solo Diana of his. Below she shares a Salus reverse with Apollo. Is there some event in Claudius' reign that led to the issue of this pair on a Salus coin?
Markl (Numismatische Zeitschrift v. 16, p. 439) attributes coins with this obverse legend to the Serdica mint, but does not note this reverse type.
There is a complete issue of 2 figure/god reverse for Claudius II. They once were very difficult to obtain but I do see them for auction/sale more frequently now.
The issue is without a doubt from the Antioch mint. While the location of some eastern mints is unresolved for Valerian to Claudius, these types are in every way typical of Antioch for the period.