If your able to post a picture there are alot of people on here who can help you or send you to the right people to know. Just don't take one person's word for something. Welcome to the forum. HH
If it's real and in at least G-4 condition, the retail value starts at about $200 and in the mint state '60' condition one variety (of at least seven) could fetch nearly $100k. As 'kam 50' above seems to suggest, it's certainly worth getting more than one opinion.
Don.....