In that condition, with only a minor part of the bracket missing, I would say $1400-1800. If it had the complete bracket maybe a solid $1800 -"ish".
I've attached a few pics of RECENT auction results, which we all know, do not determine value, but just to give you an idea. The second picture (from Barrett-Jackson) was obviously just two guys at an auction who "had to have it."
You can also see a picture of the one I own in this link (thankfully I have the complete bracket):
Before work today, I went next door to get an oil change. This garage has been in business since 1955 and the owner collects oil cans. I had a chance to talk to him. Some are Havoline, but he had some Quaker State cans, an Esso, and a really old can which was for a brand I didn't recognize. He also had a bunch of toy Texaco trucks as well as some other goodies.
For the longest time it was Texaco, but that company stopped retailing in the Northeast; except at marinas. Shell took over but they wanted him to convert into a 24 hour convenience store. He said no thanks and went with Citgo. But some folks weren't happy with that company's association with Chavez and the Venezuelan government. He actually got hate mail (And this is in New England where the Citgo sign outside of Fenway is an icon.) So he went on to sell unbranded gasoline until he took out the pumps a couple of years ago. He said that was one of the best business decisions he's made.
This isn't worth another thread, I think, so I'll just add it here.
Your rack shows up in a October, 1962 Hunter ad. It is a small picture, but it matches your rack, except the area that is yellow shows up a gray, probably the was dune to better show the pieces of equipment that should be on the rack. The red bar does not belong on the rack, it is some other picece of equipment. What should be on the rack is the "NEW (1962) MECHANICAL WHEEL ALIGNER THAT REALLY DOES THE WHOLE JOB!" incidentally, both Hunter and Lincoln"s offices are about two miles from where I live here in St. Louis.