I recently purchased an American flyer 312 smoking tender. The smoke in tender. It runs great. It does not have a bellows but the newer version. It was probably worked on. It was really in great shape. The tender had Pennsylvania on the sides. However.......... Upon dismantling the boiler I noticed that the two front driver wheels had pull mor tires.I know that pull mor tires we're introduced till 1953. I thought I had a 1946, 312. I guess I don't. There was no stamp inside the body that indicated so. What do you think?