I need advice on this 1974 quarter. It looks like a error to me or is it just damaged? I posted it on ebay ...please let me know what you think thanks https://www.ebay.com/itm/1974-quart...2?pageci=2ebd774b-3cfc-4dc0-b257-2902f3ae18ec
damaged dime too welcome to CT you may find that there is a lot to learn about coins. Since they are put in the hands of people, damage is quite unlimited. Whereas damage during the minting process can be well defined and limited.
Scott, welcome to Coin Talk. I think you should post your coins here and learn about them before you try to sell them on the bay. You will be perpetuating the Etsy pricing practice of overstating errors and asking crazy prices.
A filled in "D" ... or more precisely a filled in Mint Mark is usually caused from a die chip. The little point on the Die, which creates the cavity for the middle of the D gets broken off quite easily. Thus you'll find it somewhat common for little letters or numbers.
Always find out first what your coin may be. Just because it looks strange, different or weird does not automatically mean it is a mint error. Not really.