Wow!
That’s really cool! I’ve never seen this exact model but there were many hand vacs similar to this. As for value, it’s worth what anyone will pay for it. If it works I would value at 40-50$ but it could be more. If I were you I would take it to a vacuum shop, have it serviced, and use it as a cool collection piece. You might find someone on this website that’s interested in purchasing it.
-Jack