It will be interesting to see how this auction plays out... there is not a large market for mid 50s 21" sets among collectors,
BUT CBS sets are not common, and this one appears to be in very good condition, and from the description, properly restored. Tastes vary, but I find that TV to be quite attractive, with the cool "v" treatment and unusual knobs. I don't think $100 would be out of range at all.
jr