One never knows. You've seen what I've been finding . I'll keep my eyes peeled though. You want to be in awe? Check out that link under @Lem E's profile. Holy mackerel.
Looking through the S mints for this thread, i discovered this cent has been developing some coloring. Fingerprint is on the plastic
Knickels Not sure if the '36 is a proof, but it is an S, and i see there's no S on the '63 but it's a mirror surface.
This is my only personal set from my childhood. Not sure if the toning is leeching from the purple? But i likes it.