Welcome to the forums. Identification is complicated by the fact that the frames have been updated with new fittings, refinished and modern components installed. However, assuming the head badges are OEM, the 1st frame is 1948 to 1951 based on the palmares. Frejus won another world championship in 1954, so the 2nd frame would be late 1953 to 1954. The one pictured has a rear dropout with integral hanger, so it should be a Supercorsa or Corsa, though curiously, they look like Campagnolo, as opposed to the typical issue Simplex of the era. They also lack the oiler ports for the headset and bottom bracket bearings, that were typical of the high end models of the era. What size of seat posts do they require?

Link to OP's pics: https://www.bikeforums.net/g/album/10666303