http://www.achtungpanzer.com/pz3.htm#panzer4
Those vehicles are worth ALOT of money these days.
Restoring them is a millionaires hobby. A very expensive hobby.
I’m waiting for a bargain on this baby: http://www.achtungpanzer.com/tiger.htm
I had the 1/24th scale model as a kid - still haven’t made it to Aberdeen or the IWM to see a real one.