Or do the hot pin test !! And as Wendy and I can tell you,, it really doesn`t matter if you have the only one like it in existance,,that will not make it valuable to any great extent !! In order for an item like that to be of great value there needs to be a collector base, past sales records and a signature to prove who made it !! Some items are so unique and are limited in number that even without a signature it can be attributed to a single person !! Like furniture for example which is rarely signed but when you see enough of that style,, you know who made it !! But without that its still just a piece of old furniture and isn`t worth near as much !! I know you want it to be an expensive and rare piece but I wouldn`t hold my breath if I were you !! Still its a nice piece with a bit of a deco look and would good on anyones shelf !!