2007 D Lincoln Cent Obvrs Biz Strike Rvrs Mirror Prf Finish. New Pics*

Not a mule coin. A mule coin has two different series of coins on the coin:


Different from an over struck coin with a different denomination:

This one had a normal strike as a dime. Then the second strike was with a cent pair of dies.

It's a normal coin with fingerprints.

It's really hard to tell from these pictures. A 2007 proof cent would have deep mirrors that reflect the camera or other objects. It could be that the reverse die was damaged and had to be polished. I've seen lots of coins that have small patches of mirror in the fields from die polishing.

My guess would be a "proof like" look to the reverse on your coin.

I would have to say there is nothing strange about your Lincoln Cent , just a regular business strike . Your showing us 3 different colors of this coin . For proper attribution of any coin the exact and real color of said coin is very important .

Whenthe dies come for hardening/tempering they have an oxide on their surfaces. This is remove with a acid pickling and the the faces or lapped to make them smooth. If they get too aggressive withthe lapping the result is a PL surface and the coins struck from that die also have a PL surface until the die starts to develop the microsopic flowlines that then impart luster to the surfaces.

So basically you have a brand new die that was overpolished slightly.