That's a great model and it looks like it's in very nice shape.
It was a top of the line model for RCA in 1937. 11 tubes, 'magic eye', 'magic brain' (motorized tuning), and the 'magic voice' (12 inch 10 watt speaker).
I read somewhere that it cost something like $692 when new which was about the price of a Ford car at the the time.
Lot's of information available on that model on the internet.
Here's a great RCA service link to get you started with the schematic and other service info (just scroll down to the model number).
http://oldtech.net/RCA.html
Great score! Have fun with it.