I came across this denarius in a group of four coins listed on
ebay. It is of Geta with reverse of Dea Caelestis riding a lion. This reverse type is known for Septimius Severus and Caracalla, but not for Geta.
I checked online fake ancients sites and couldn't find any examples of this mule.
The style looks a bit "off" to me, but I am no expert. What do people think, is this a fake or an unknown mule? I put in a bid on the lot, curious to see what the coin looked like in hand, but didn't win the auction. All I have to go on are the auction photos.
Here are the auction photos and links to authentic coins of Severus and Caracalla.

https://www.vcoins.com/en/stores/mu...Default.aspxhttps://www.vcoins.com/en/stores/he...Default.aspx