I’m fairly certain it is a Seleucid coin, with an elephant on the reverse. Whether it is worth keeping is up to you, really.
I agree with @Nicholas Molinari, it's up to you to determine if you think it's worth to keep it. It is by the way a pseudo-autonomous issue from Apameia (Seleukis and Pieria). Example (not mine):
If you don't want it, give it to someone (kid?) who might think anything 2000+ years old is worth keeping.
Yeah, I should have included an emoji, it was "tongue-in-cheek" - borrowed it from U.S. moderns. They (I) like to do that.
I think it's pretty cool. You can mostly identify it and there are still some details left. I think, if nothing else, it is a keeper until you find an upgrade.