Looking for confirmation that the reverse's center blob is probably ex-jewelry and not a cud. Thanks for the input.
Don't know exactly what that is, but it is not a cud. A cud involves a rim to rim raised area. It could be a die break, or as you said a jewelry piece. Is the blob as hard as the other metal? If silver solder was used it could be the same hardness (or close to it). if common lead solder was used the blob will be much softer than the surrounding metal.