Ok so I was metal detecting at an old park today that is also used for festivals. One reason I chose this place is because they have pirate festivals there. Ya know, when people dress up and stuff but also wear some really nice coin necklaces and sell actual artifacts ! So I get this hit and its ringing like a 19-20 so I'm thinking penny...but when I got it out it clearly surprised me. It's the size of a nickel, definitely copper and thin like a dime. Could it be an old flat button? A spanish cob?! Please anyone that has any idea or has seen something like this I'd love to know! Thanks guys!