Heavily corroded environmental damage. Honestly, might have spent some time in a potty. What do you like about the coin?
Honestly no clue why I like it. I just started collecting coins with my daughter so this all new to me. Maybe it's the colors on the front or the brown on the back with different shades. Or maybe it's because this is the first coin I found that was messed up so bad.
Environmental toning is damage, but if you like the coin, by all means put it in a 2 x 2 and hang on to it.
It's suffering from environmental damage but if you like it, keep it. Enjoy the hobby with your daughter. Welcome to CT.