I presume it's an ancient counterfeit -- it's underweight and doesn't quite match any official issue. Yet, there's no indication of a base metal core. I can find no other example of this coin online and I've looked at acsearch info, Coin Archives, Wildwinds, The Coin Project, OCRE, and v-coins. It is not in Sear, BMCRE or CRE. Sorry about the photo; the coin itself has frosty and porous surfaces, as if it were harshly cleaned by acid, and it doesn't photograph well. I'd love to hear your comments about this one: Julia Maesa, AD 218-225. Roman (counterfeit?) AR denarius, 2.35 g, 19.2 mm, 5 h. Roman mint style Obv: IVLIA MAESA AVG, bare-headed and draped bust, right. Rev: VENVS VICTRIX, Venus standing left, holding helmet and scepter, shield at her feet (reverse type of Julia Mamaea, RIC 358). Refs: Similar to RIC 275 and Cohen 52. Here's the listing in RIC, but the reverse description doesn't quite match: Rather, the reverse type seems to be this one of Julia Mamaea, RIC 358: You'll note the footnote in RIC speaks of an eastern issue where Venus holds a statuette. This undoubtedly refers to a coin such as this one, sold by Naumann (Auction 69, lot 399, Sept. 2, 2018): I suspect that Cohen 52 (which is cited by RIC as 275), is actually this coin, but the reverse device was unclear and Cohen, expecting to see Venus Victrix holding a helmet, described it as a helmet: BMC lists a large variety of hybrids mixing obverses and reverses of Julia Domna, Julia Maesa, and Julia Soamias, but this isn't on their list. The BMC does have a denarius of eastern mintage (purchased from Curtis Clay, interestingly enough), which depicts Venus standing left, holding a vertical scepter in her right hand and cornucopia in her left one: So, my coin doesn't appear to match any official issue and appears to be a mule combining the obverse of Julia Maesa with a reverse type of her daughter, Julia Mamaea. It's almost certainly a counterfeit, but doesn't seem to be fouree.