While looking through my inherited Mercury dimes, I came across this oddity on the reverse of a 1942 no mint and I'm not sure what to make of it. I think this would be considered a cud?? I am NOT an expert however and would greatly appreciate some help and insight from everyone!
A "cud" by definition can only be connected to a rim of a coin. Might be something else significant though. The experts will surely chime in.
Kind of looks like solder where a pin might have been attached. Welcome to CT, wait for more opinions.