all surfboards (epoxy and polyester resins) are fiberglass, despite what most people think. people have the common misconception of calling polyester boards fiberglass, when theyre all fiberglass. fiberglass refers to the cloth, not the resin. as far as it being signed by rusty, that just means he shaped it himself. youre probably referring to the pencil signature on the stringer by the dimensions. These boards arent that rare believe it or not, so id say its probably worth a hundred bucks brand new, otherwise its less depending on condition. sit on it for a few decades, then youll have something to get excited about.