[LarryFS]

Welcome Lisa!  I think your guess is very good.  The dial pointer on Oma's radio has a distinctive center area of concentric circles.  The only Transitone I can find with that dial pointer is a Model TH-18 that was introduced in June 1939 for the 1940 model year (see https://philcoradio.com/gallery2/1940a/ and scroll down to the Transitone model photos).  The TH-18 isn't like the radio you have; but, note that there are two radios listed in the group that have no photos.  Maybe Oma's is a TH-9 or a TH-22.  My guess is the TH-9; but, I'm not a Philco expert.  I'm sure a real expert will chime in.