I came across a 1955 S with what looks like a strike through grease on the reverse and the mint mark has a die chip or something included.
That’s a good one! I wonder if that’s not a chip in the mint mark punch? I’ve seen several 1955-s that look like that. It may also be a weak spot on s marked dies? I will research that at some point.
As with most of my earlier coins, they were found in circulation and are just now getting a good look. Hope to keep coming up with nice ones. Thanks for the encouragement.