The filled area on the 9 is a die chip. ' Cud' refers to a broken die and involves the rim of the coin. It shows as a raised area on the side with the broken die and can cause an area of weakness on the opposite side because of the metal flow into the Cud.
Here's what a Cud looks like on this 1983-P Jefferson nickel.

ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!

























