I was given this sewing machine pictured below today. It seems to me to be very old. The name of the sewing machine is American Rotary which was manufactured by National. The model number is R40. I do not know where to find out how old it is, or when it was made. It also came with the cabinet below. I am not sure if it works or not because the power cord is broken up. I like to know how much it might be worth. I am thinking about selling it.
Picture of the sewing cabinet
Picture of sewing machine on the manual