I'm an amateur coin collector and every once in a while I look through my change for anything different, interesting, or mistakes that i know of. I saw a 1970 dime that does not have a "S" above the date. I researched this online and I'm still somewhat confused. As for being used, it is still in very good condition. I saw online that a dime from 1970 that does not have a "S" mint mark above the date can be worth in excess of $750. I've heard of this certain coin being sold in circulated condition or in "proof(s)" (which I am still not totally sure what that is.) Any help with this would be greatly appreciated.
The 1970 no "s" that you are referring to is on the proofs only (which come from proof sets). It sounds like you have a regular 1970 dime minted in Philadelphia. All the Philadelphia dimes are minted with no mintmark. Proof sets are special coins that come in sets made and sold by the U.S. Mint.
