[Radioroslyn]

I would suspect that the extra coils are for the old police band, as you go higher in frequency w/a trf set the selectivity drops off. You don't really see very many trf sw sets most are regenerative or superhets. I have several Simplex sets that are very similar to yours electrically that are two band sets. The second band isn't calibrated or noted on the dial. These use a 58,57,47, and an 80. Simplex model N it's kinda strange in that there is an ac model that is a trf and a dc model that is a superhet.Perhaps a year or so new than your set.
http://www.nostalgiaair.org/pagesbymodel...043257.pdf