I feel like Roman coinage for the most part peaked in the first half of the third century AD. The sestertii in particular are just really nice, though financial conditions meant they often didn't make that many, as they were focusing on denarii to pay the troops, and inflation was shrinking the value and usefulness of this denomination. When I was still collecting, it was hard to get any of these sestertii that had much detail in my price range. But most ancient coin collectors have no tolerance for coins that are broken or incomplete in any way, so this sesterius of Philip I (reigned 244-249) stayed well within my budget. I should probably take a proper photo rather than just this image from a scanner at some point, but hopefully you can still see the style well enough. My guess is that this coin didn't actually break (it's a pretty thick piece of brass, so it's not easy to do) but instead the blank wasn't formed right, and this was a period where they really just needed pump all coins out fast, so this was considered acceptable enough to keep.

Note about ancient coin collecting in general: while there's a lot to love about the field, the sources for these coins are often much shadier than friendly store fronts make it appear, and the ancient coin market is the cause of a lot of archaeological damage. I stopped collecting years ago when I finally really started looking into the problems, and I'd recommend not supporting the market in general unless there's some major reforms in industry standards that I really don't see coming.