It has the word 'copy' stamped on the back of it. Just a random guess, but I think it might be a copy. Just a hunch.
Uhh... As far as I know, an authentic coin would not have the word 'copy' stamped on it. I've actually seen people sell replica NH halfpennies that look exactly like yours, and have the word 'copy' on them. I believe you have a coin from one of these sets. http://www.ebay.com/itm/like/263124...7290-0%26rvr_id%3D1292501742428&ul_noapp=true