I think you have properly identified the issuing city. I see ANTONIN on the obverse and after lightening the images, it does look like Caracalla. Here's a similar coin. Looks like someone removed Caracalla's calvarium and his brains are showing https://www.sixbid.com/browse.html?auction=3105&category=63676&lot=2595513 TROAS. Alexandria. Caracalla (198-217). Ae As. Obv: AV K ANTONINVS PIVS AV. Laureate, draped and cuirassed bust right. Rev: COL ALEXAN AVG. Apollo standing left, with foot upon altar, holding branch. Bellinger A298. Condition: Good fine. Weight: 7.09 g. Diameter: 22 mm.
