As mentioned previously, I was to pick up Motobecane's from my sisters. I picked up one. It is a 1977 Mirage, 21 inch frame, silver in color. This is the first year for the Mirage model (Super Mirage was in 1976). This is the last year for the 1020 tubing for the Mirage. It still has the original tires on it, Michelin Gum Wall, 28-630, 70 PSI tires. Of course they are totally dry rotted. The SN is 3805781. So the 4 million number was crossed somewhere between the end of 1977 and early 1978.