I believe you will find you have an International Models 4-4-2 on your hands, produced in Japan in the years just following World War II. The company made all-brass models, and by that I mean everything was brass- including, frame, wheelsets, axles, valve gear, and motor worm gearing. This could be a bit of a nuisance for operators when brass bearings and gears were mated with brass counterparts. If compatible non-brass pieces can be found or fabricated to eliminate brass-on-brass wear surfaces, you may end up with a unique model which runs. Some here would probably like an update on whether it is an International or something else. Good luck with your acquisition.
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