I just bought some Jefferson nickel, which is a new item for me. I've read some things about metal composition but I dont know how to verify, validate, or distinguish them. If anyone can provide info, I'd appreciate it. I've lined up 6 nickles. The top are the standard composition, as I understand, but the others are not grey and the bottom right has more of a copper tone? The second pic is of the 2nd & 3rd right column, of 1st pic. Also, a 54 S is in good (enough) condition?? Or not? ...I decided to add a '54 D that looks like it might have a repunched D?