Any info on a company from Chicago by the name of guthman? Thanks

A check of the "usual suspects" (i.e., ghost radio manufacturers)by me turned up nothing. Your set was probably made by one of the dozen or so contract manufacturers responsible for 99% of all radios sold in the USA (hundreds of individual brands); however, determining exactly which one of these made it will probably require a close examination of the set and how it was constructed.

The "ghost manufacturers", such as Gardner-Wells and Continental, in addition to building a gigantic number of sets for the national chain stores like Wards and Sears, also were happy to create small production runs of "private label" sets for local or regional retail store chains. These were usually existing radio designs that simply were re-badged (new dial artwork and/or case stickers/decals)for the new, small-volume customer. This minimized "non-recurring" (design engineering and tooling) costs and kept the sell price reasonable. I suspect that your set is one of this type. It may say "Chicago" on it, but that was probably just where it was made. It could have been shipped to, and sold, almost anywhere in the continental US.

You might try posting clear front and rear photos of your set. If it is a "private label" radio, there is a high probability that someone will recognize it in a more familiar brand incarnation.

Also the tube lineup can help identify possible candidates.

Richard