That looks like the one i used to have .Older heavy guage metal.
I see that he has added the grate level thermos . If it has all the mods done to it and has no damage and very little to no rust, It is worth close to 2 bills.
Check the legs REAL good as they were a source of aggrivation. they weren't strong enough IMO.
Also check around both doors for warped areas.
The warped doors is a fairly easy fix .
Just like a used car ,The more dents and dings you can find the more ammo you have to haggle on the price.