What would cause something like this ?

This 1979 D mint mark is just so very dark no matter how I turn the coin, and I think there may be a bit of a cud in the center? Got any input on how this comes about please?

 

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That's not a cud.. It is a Die Chip

Cud is When it involves the rim

These are cuds -

 

1) CUDs have to come from the rim of the coin towards the center like this:


2) Coins, up until 1989 I believe, had their mint marks hand punched on the dies. A lot of the times, the little die posts broke which caused the mint mark to be filled (like in your case I believe). There could also be a small die chip inside the mint mark but it would be very small.

 

OK thank you so very much

 

When you think about it, on the die, the cavity of the center of the D is a little peg, and it is understandable how it can break off.

 

Didn't know that thank you