A close friend recently passed and among his effects was an Oliver crawler Model OC4-3-D. I have found out so far that they were built for about 9 years from 1957 to 1965.
His widow, who is a close friend of my wife, has asked me to research the machine for value, etc. and I literally stumbled across this website and forum, which seems, bluntly, to be the best put-together of any of the sites devoted to the Oliver/Cletrac equipment.
(And to be honest, I was really not aware of the extent of the number of folks involved in the collection and restoration of these machines. Makes my hobby of fountain pens look wimpy...

)
Any help you can give me, either here, or back channel, will be greatly appreciated.
Thanking you in advance
Bill Wright
Value depends on a lot of things. Does it run? what attachments does it have? Loader winch etc. What condition are the tracks in? if you could post some pictures that would help.
On the middle east coast MD,PA,VA etc These machines are pretty
valuable. I'd say:
Sitting in the field for ten years & stuck you would probably still
get $500 to $1000
In a good location, movable, not working $1500
In a good location, movable, running, rough $2000-2500
Good running, needs tlc $3000
Restored $5000-6000..