[Radioroslyn]

Have had a few over the years. Yours looks to be in good shape, some the cases warp and are hard to close. They do have a bunch very high value 1/2 resistors (1 meg +) that may be problematic. The loop antenna is part of the front door and is connected though the hinges. I think it uses a 67 1/2 and a 7 1/2v batter for the filaments.. Continental (Admiral) made some versions similar to this set. It an  A.T.T.P. model. Sam's has the info, Riders and Beitman don't.

Terry