error coins

hello everyone my name is eduardo magdaleno but you can call me young mag. i recently became a coin enthusiast. I only know a few errors and dates. i live in california and i am looking forward to getting educated as much as i can on coins. i really think this is my calling. well enough of me here 's my ? i can across two coins that i think are discovery coins one of them is a 1958 d ddo ddr error coin the other is a 1999 d ddo ddr error coin, i know what you re thinking that my coins are most likely not what i think they are and i wouldn't blame you because they simmply dont exist i mean their is three 1958 's from the philidelphia mint those you can goggel and they show them . here's a few images let me know what you think,