Cuds Are Errors Too, Aren't They?

zeewool,
Based on the reverse pics, the Barber dime was soldered(probably a pin attachment). The 1939S Merc has damage of some sort and the 1942 Merc is damaged as well in addition to some solder on it(you can see bubbles).

Buzzard,
If a dealer called those marks " Cuds", then that dealer is not very familiar with errors. Unfortunately, it is one of the most misused terms in numismatics. You cannot have a Cud in the center of a coin, that would be an interior die break but that is not what it is either. A Cud is a specific type of die break that affects the face and shank of a die and will create an area of weakness on the opposite side of the coin. The shapes are way too irregular to be die breaks not to mention that the left side of the blobs form a perfectly straight vertical line bisecting the coin. Most likely explanation is left over solder from a pin attachment.

I believe this is a Retained Cud...because some of the denticles are apparent in the cut. I apologize for the photo quality. I haven't taken the time to reshoot this coin after getting better equipment. And, yes, the coin was cleaned at some point. I like Cuds, so I keep this one.