must not be many of them around.
I looked for a Massey harris 55 with frontend loader to see what they were asking for them.
I never found a 55" massey harris with a loader mounted. If the old tractor has power steering i would start at 3500, but without power steering it would be a man killer to drive,
if the attached picture is what type tractor you are talking about, a 55" is a big tractor.
there were a number of 44" narrow frontend with loader, but never found a 55"
might get more for it by selling the frontend loader seperate, if it has a seperate hyd pump as the loader might fit a number of other tractors.
ask around some, as there must not be too many of these tractors with loaders, who knows what the means, could be good or bad.