Allvit is 2nd generation which, if OEM, would place it 1961-1968. Given the era and the presence of forged dropouts, this would make it at least mid-range. I'd expect it to have at least butted main tubes, though the presence of cable stops was generally allocated to entry level models. Post should be 26.4-26.6mm for a butted seat tube. The lever bosses are almost certainly an addition at the time of repaint. Sorry, but I'm not familiar with pre-boom Motobecane models.