Is this really a Royal Sovereign made for Crosley by DuMont, or is it just a Crosley with a 30BP4? It has the vertical slide rule dial, but the knobs are in the wrong place.

The Royal Sovereign did not sell well, not only due to the high price, but because it would not fit through the doors of most homes and had to be lifted in through a window.

The DuMont image below is from Steve McVoy's web site.