Very, very nice original bike. Please try to resist the temptation to not keep it that way, they are getting harder and harder to find and yours will bake a wonderful reference for someone restoring one. I have double that in my Roadmaster project bike so far and it will never be as sweet as yours.
The rear sprocket is showing some wear I think, but when you have the rear wheel off and regrease the hub get a straight on shot of it... there are still new sprockets to be had for the New Departure hubs, if that is what it is, but the more teeth they have the more $$ they get to be, as everyone wants to gear down these bikes so they can still ride them.
Again, a beauty and a bargain. Congratulations.