checking what something like this should be expected to be worth?
1940-1950 ish they think it is.
Wonder Wizard - Demolition Derby
and its a home model ?
See pics
These were made in the late '70s (I want to say 1978) as home model machines. There were 3 different artwork themes: Demolition Derby, Star Explorer, and Flying Aces. All of them had the exact same playfield layout.
Here is a flyer for Star Explorer:
Honestly, a 100% working example is not worth more than $100. That seems to be about the average price I have seen.
Despite the low price, I think they are actually kind of cool. It would be a nice addition to anyone who doesn't have the room or cannot afford a full-size pinball machine.