I know how it feels when you think you have found something very valuable and it turns out to be not what you thought it was. I found a gold and diamond tennis bracelet stamped 14k. The gold was real but unfortunately the diamonds were not...possible value $4,000.00 plus...actual value $90.00. But I took it to 3 different places for opinions and testing before I would believe it. Take it to a coin shop that deals with things like this every day and then to another and then again another. I hope for your sake that it turns out to be the real thing. Like others have said even if it is a copy it is still a great find and if it is an old copy it may still be worth quite a bit. Good luck,
HH Charlie