Hey, I just stumbled onto this topic after searching for the words 1970D Nickel Proof. I was going through my Grandpa’s coins, and among the nickels, there was a roll (one of those kinds you get from the bank that have rolled ends). It was marked 1970D and U for uncirculated. The coins visible at the ends looked really prooflike so I opened the roll (I worry that was a mistake now). Anyway, the coins inside are deeply mirrored and really do look like proofs. Here are some photos.
What do you guys think?