Here are a pair of Louis Marx & Company O gauge freight cars from the postwar period - both 8 wheel cars with type F trucks and diecast wheels, with tilt plastic couplers  There is a 4528 Erie flatcar, and a 51100 Southern autoloader.  The Erie flat is NOT a rare color variation, but looks to be the result of exposure to some sort of chemical or cleaner.  The autoloader looks good but has a piece out of the gray superstructure..  Photos show both cars from all 6 sides with a yardstick in the shots for size reference.  Priced reasonably with only actual USPS Ground Advantage or Priority Mail shipping cost for the slightly under 2 pound package charged!