60's Powermite Powerboard- Motorized Body Board

I’m trying to sell stuff from my father’s basement to help him to get one of his old cars running. He picked up a powermite powerboard. I found the patent for it, but not sure what i could list it at. Anyone heard of this before?

https://imgur.com/N6DwmYV

https://patents.google.com/patent/US3371646A/en

Maybe reach Wayne from Jetboard limited he is doing a museum in spain