I found a Massey Ferguson screwdriver once, but it had Massey Ferguson spelled out, and a modern looking acetate handle.
That being said, as far as I know, if it was a Massey Ferguson wrench, you think it would have their triple triangle logo, not just MF in a rectangle.
Edit: the only Miller's Falls sockets I have seen were in a 3/8 set, the ratchet in the set was clearly a Penens/Proto rebrand.