I purchased the coin below at a show from a dealer who I had read is very well-regarded. Their inventory at the show was pretty much all high-end stuff, with this being, by several hundred dollars, the cheapest item they had available. I had a great conversation with them, and they clearly knew a lot about all of their coins! This coin was tagged as being a sestertius of Julia Maesa, and being new to the hobby, I assumed that was correct. The dealer even told me a little about Maesa's life, and told me that her sesterces are not that common. However, when I got home and tried to find a RIC number for it I was surprised to see that this is clearly Julia Mamaea, not Maesa. Indeed, if I had been a little more careful and read the inscription before I bought it, I would have seen that it clearly states "IVLIA MAMAEA AVGVSTA" on the obverse (the legend is clearer in hand than in the image below). I'm happy with the Mamaea sestertius, and had no specific goal of getting Maesa, so I'm not disappointed. I suppose the price was probably a bit high for Mamaea in this condition (it looked a bit on the low side for Maesa compared to listings on vcoins), but I don't think it's worth trying to return it. My lesson, though, is to carefully inspect and look up any coins before buying them in person.
Julia Mamaea, Sestertius, 222-235 CE, 30 mm, ~20 g, 12h; Obv: Bust, diademed, draped, right. IVLIA MAMAEA AVGVSTA. Rev: Felicitas, draped, seated left, holding caduceus in right hand and cornucopia in left hand. FELICITAS PVBLICA S C.; Ric IV Severus Alexander 679
Please share any Julia Mamaea or Julia Maesa coins, or any coins you have that turned out to be something other than what you thought they were when you bought them.