Roman Coin - Identification Help Requested

From my research, I think that this is of Caracalla. Other than that, I am coming up short. I like the size of it, being close to the size of a half dollar. Thank you!

 

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Looks like some non-Roman letters there...Provincial?

 

Possibly. I am very new to Roman coins. I was puzzling over the letters myself. It almost seems like a mix of Greek and Latin letters. At least, there is no "P" or "C" in Greek. Pi looks like Π and Sigma would be Σ.

 

This is a rarer coin from Caracalla


Caracalla. Serdica, Thrace (Sofia, Bulgaria) 211 - 217 A.D.; Obverse: AYT K M AYP CEYH ANTΩNEINOC, laureate head right; Reverse: OVΛΠIAC CEPΔIKHC, Tyche-Fortuna standing facing, head left, kalathos on head, rudder on globe held by tiller in right, cornucopia in left.
Varbanov 2477

 

Thank you! Now the big question... How did you find that information?! Are there any tips/tricks?

 

The legend on your coin was pretty easy to make out combined with the Fortuna/Providentia reverse. If you recognize the reverse types it is much easier.