Here is a tin lithographed passenger car.  It is lithographed tin, with a metal frame, metal axles and plastic wheels.  The car has the number 4 on it, and MT in several places.  Not sure if that is the railroad name, or it is the manufacturer.  Cute little thing but needs to go to a good home where someone knows what it is!  Plastic wheels on metal axles, looks complete.  Photos show the car from all 6 sides, with a yardstick in the shots for size reference.  I tried it out, and it it is a bit too narrow to roll freely on O gauge track - perhaps about S gauge??  Priced fairly, with only actual USPS Ground Advantage or Priority Mail shipping charged (your choice).