The photo on the left looks to me like Massey-Harris Model 22. The photo on the right looks to be Massey-Harris Model 44 Standard. Neither of these models would have been on the assembly line in 1957, which would appear to be the date hand written across the bottom of the photos, both of which say Sept. 24, 1957. However, if you look at the numbers written in white in the bottom right corner of the actual photo, it suggests to me that the photos were actually taken in November of 1947. That would match the appearance of the tractors and the Models 22 and 44.
Those are my thoughts. :-)
Thanks for sharing the photos, John!