I found one in a roll of 1961 D cents that I have had since 1961. Is the die chip on the right end of the building what we call a beehive? Also, what looks like an RPM I think is just reflective doubling. Any feedback is appreciated.
The D mint mark looks like what Wexler calls Die deterioration Doubling. Here's a few examples from his site: https://doubleddie.com/144843.html