Hello fellow numismatists, As always, identifying ancient coins is always a challenge to me, even though I bought me a very good book (krause ancient coin collecting). This coin is about the same size of a nickel and like the design with the antelope on the reverse. (I tried to decipher the letters around on the emperor's head and I think it could be Gallienus). Any help (as always) will be greatly appreciated. Best, Monetarium
You are correct about this being Gallienus. He's easy to spot, since he has a very distinctive bust. The denomination is the antoninianus, which is marked by a radiate crown on male buts and a crescent moon shape under female busts. This denomination was once mostly silver, but by this point really only had trace amounts. For identification help, I find that this site is great most Roman coins as long as you can tell the emperor and a bit of the legend. Looking on that site, it appears that you have RIC 181.
Dear Gao, Thanks so much for the insight! Glad to hear that I wasn't mistaken about the emperor. Thank you also for the website reference. I was just checking it and I love the format. Thanks again and best regards, Monetarium