Caligula coin expert required if possible

[MrMidas]

Just thought I’d see if there’s any Roman coin dealers or experts to pick there brains on a coin i have had for some time that came in a job lot of coins ,it was in a little plastic wallet so who ever was collecting them back then kept it stored better than 95% of the others so it stood out like ,.after a little research the only one I can find of it seems to of sold at an auction a few years back for 16000 rand which equates to about £15000 ,but I just know I not that lucky after a life of gambling what are the chances of me hitting my jackpot with a loose coin I think ?,..it’s gota be a fake I reckon any thoughts would be appreciated cheers