I believe that is a Rollfast or a Firestone bike. Either way probably made by Murray. And YES, Definitely worth the $50 especially with the tank and the lens is a definite plus.
wow that is amazing october check out my build off bike. i know that it started out as a wards hawthorn and the frame, chain guard, and sprocket are identical to your rollfast. guess it was one of those parts sharing deals between manufactures back in the day. awsome score i would almost be tempted to keep that one original.