Going through my pocket change found a 1979 D over p it looks like or it is a die chip is that would be a cud and the A on the back is kind of the same way allso there's no reading on the coin the copper is all the way through
Take a look at the condition of your coin. It has numerous marks, digs scratches etc, which isn't unusual for coin that's been in circulation almost 40 years. coins that show heavy circulation or environmental damage can appear to have "mint errors". However, these are almost always due to circulation. This is the case with your quarter. Sorry
You're looking too closely at your coins. There is nothing there at the D of Dollar. Sorry - and don't forget that coins in circulation get banged up a little bit, sometimes alot, and so if you look closely at almost any cic coin, you'll find contact marks, bag marks, etc. that are due to normal wear and tear of coins.