Yes, the serial numbers indicates a 1986 model but I knew it wasn't American market the moment that I saw the top mounted, aero shift levers and the friction New 600EX. Both are typical of European models for 1986, though they're typically branded Koga Miyata and their 1986 model with Shimano New 600EX was the Roadwinner. So, while it's a better match than the Amerian market 912, it still isn't perfect (wrong model, wrong tubing decal, no contrasting head tube).

I'm not aware of Sweden having a different Miyata importer and models than the rest of Europe but it's possible. Most brands imported into Sweden share a importer with the other Scandanavian countries and the legislated bicycle VIN system for Denmark does not include Koga. It would be interesting to know if there is a 2nd serial number (i.e. Danish VIN), which is typically located on the lower down tube or seat tube.