Hi. I am new to this site, first post. I came across what I think is a neat Bicentennial quarter, looked online for some information but am clueless about coin collecting. I think it is neat because the front side has the coloring of a basic quarter, sort of smudged silver, but the back has this goldish tone to it, not like a gold made quarter, but the tinge is just goldish.
I was wondering if this is something unique, but am really interested in if any of you have any ideas as to why it would look like this, I am interested to find out why it happened!
From what I understand, it is from Philadelphia, there is
no mint mark, but that is all I really know.
Here are some pictures, the quarter on the left is the one I am asking about. The one on the right is just another Bicentennial quarter for comparison in pictures.
Thank you for any info that you can give!

