I'll just guess that it could be a circa 1980 Super Mirage. It was from 2040 steel, came with Bocama lugs, was available in champagne gold, and had Weinmann rims, but I'm not certain they were Concaves. (Based on the fork, I suspect they too are period replacements.)

You did well for the price but no way is it worth near $300. Still a good bike though. Finish building it up and enjoy it !