I'm not exactly sure what these particular coins are called but they all have an S mint mark ,mine has a D .is it no

Denver has only minted proof coins on rare occasion and I don't believe they've ever done cent proofs. Your example looks as though it has been polished.

Your Cent is not a proof CENT. It's an altered surface. Done as a novelty. Not an error of any kind unfortunately.

Actually, the seller indicates them as silver. Probably silver plated which might be considered a novelty, but to most collectors it's considered damage.......

Proof coins are made from blanks that are cleaned and polished, they are then struck on special presses that are higher pressure and are struck more than once with dies that are made for proof coins. This gives the fields of the coins a mirror finish (except for matte proofs) and the edges of the coins have 90 degree angles. The other coins are called business strikes. Hope that helps

I would venture to say that by 2007 100% of proof coins were cameo and deep cameo. Beside the fact Denver didn’t produce any proof Lincoln’s I don’t think you could even find a 2007-S proof cent that wasn’t at least cameo. The 2007-D Lincoln is for sure polished, losing any value it may have had.