Leo, I was very young when my dad bought a red 6000, 1961-62??. I think the red ones were the first. Ours spent more time having the SOS repaired than it did in the field. Things were so bad, after a few years, Ford gave us an new blue 6000. It had a better tranny. Ford was so cheap, they gave us a new tractor, but we had to put our old tires on it.
If I got my colors right, red was the first. All I can say is RUN FOREST RUN!
To this day, I wouldn't have an SOS. 2 reason, most of the old mechanics that worked on the SOS are long gone. Secondly fool me once shame on you. SOS = SOL
Just because they are rare, doesn't mean anything. George