I don't think that is a Dual 50..............the Dual 50 had the oval plastic insert in the light cap that lit up, "Kirby", when you turned it on. It was the only Kirby made to have that feature.
It also has a bojack conversion bag adapter, (and bojack bag), so it can take disposable bags. The 50 had a sani-emptor and shake out cloth bag. The front wheels are mismatched. They should both be of the small size--so it could be a wrong axle size.
And with a broken fan? They should PAY you to take it away for them! I think a vac shop must have done a rebuild using the tan trim. The box shown has the red logo and red handi-butler cable. They must have combined parts from 2 or more vacuums to make this usable.