What year was dressmaker model 850 sewing machine manufactured?

In 1949. Just after the war, Lenonardo De Caprio went and consulted a dressmaker, asking for some super tight pants. Ofcourse, theese werent around in those days, so they invented a new sewing macchine for them. He got his wish- THE PANTS WERE BORN!! and so was the dressmaker 850!! (who sewed his pants)