Very Old Coin? Silver, Helmeted Man, Stamped Sep. Sides

Commercial fantasy of an ancient coin. Not meant to deceive.

It's not very old - that pattern of radiate stripes is late 19th, early 20th century. I knew we'd seen a similar piece on the forum a long time ago, and I've only just found the thread with it: here. It's not quite the same, but it's got a similar thing going on with the helmeted head - only naming him "Hector", the hero from the Trojan Wars. I'm not sure if your helmeted fellow is supposed to be Hector too, but the guy on the other side of yours, with the big club behind him, is perhaps supposed to be Hercules, the mythical Greek demi-god.

The other piece is holed, for wearing as a piece of jewellery. Though it's hard to be sure, I'm seeing signs that yours may have had a loop attached at the top, which has since been broken off - which may explain how it was lost. If it's "just a piece of jewellery", then you're not going to find much if any information about it in the catalogues.