World coins, A? I am pretty sure this one comes from Earth. I have it marked (for now) as 224-561 AD Indo Sasanian AR Drachm. It is the first broad flan type I have found. It just came today.
Beware of Chinese copies of anything typically higher in value. eBay is awash with copies of these and other things. They can be bought on alibaba for a few dollars.
Well, to kinda put that into perspective for me, and you - there is a good probability that I was collecting coins before your mom and dad were born