All the Japanese manufactured Miyata came out of the same Miyata factory in Japan. Starting in the very late 1980s, the manufacture of some entry level models were contracted to Taiwanese factories but these can be identified by the country of origin label and/or serial number format. Typically, with global brands like Miyata, there are several marketing regions, each with their own design departments that tailor the models to suit local preferences. I don't know how many distinct marketing regions Miyata had at this time, but there was at least three that were served by Miyata of Japan, Miyata Bicycle of America and Koga-Trading. Canada had a separate importer, Oxford Bicycles of Canada, but received the same models as the USA, so I group Canada and the USA together. I imagine there were several similar cases. The only catalogues I've seen have come from these three regions.