These all have original paint
and original metal backs (beware of "original" versions that don't
have stamped directions on the back). This model is usually more
popular than most other metal midgets (Arvin and otherwise) in
desirability and hence, price.
Some rust is common with
many of these sets. Sometimes it's very superficial and shouldn't
scare you off if everything else looks good. Dents were also
common, as these were made to go into the garage, work shop or
someplace similar.