Not worth much(if anything beyond face) I don't think but I like to keep the nice older copper coins I run across. Yours has a few spots on the reverse so I don't know if I'd keep it or not. In the end it's really up to you.
A coin being "brand new" doesn't really constitute it as an error coin, it just means it hasn't circulated as long as some others...is there something different about this coin that you think might be an error?
