hello everyone...i have a question that i am sure someone out there can answer for me. i recently had 2 dozen decoys given to me by an elderly lady whose husband has passed on. i have never seen anything like them before. they are rubber like the boot out of a tire. i found a name on them they are called PLASTIDUK they are/ were made in berkeley, CA by a company called neumann and bennett inc.. if anyone has any idea exactly how old these things are or how much they might be worth as a collectors item could you please let me know. they are kinda neat.. they have a valve like an inflatable football that you can pump up with air right underneath their tail feathers in the back.