Sadly the Mercury dime isn't actually a representation of Mercury. Like the Buffalo nickel is actually not a buffalo, it's a bison. The Mercury dime is a representation of liberty with a winged Phrygian cap which symbolizes freedom of thought. So it's definitely not a him.
But no matter still a cool find. Last "Mercury" Dime I ever got in change was in the 70's, getting one 40+ years later is pretty cool!