It's interesting. The sticker on the seat tube says tange prestige, but that was an 89 steel, in 90 it was tange concept.Paint looks correct for a 1990, although a full frame shot would help. Judging from this guys vid, looks to be a match. Guessing it was just an extra frame they had laying around that they pushed it into the next model year for paint & sale. Assuming it was sold in Europe & came from Canada, perhaps they loaded the shipping containers 1st to get them to market on time & some U brake 1990's were in the mix.