WHITE ROTARY!!!!!?????????????!!!!!!…

I have a old White Rotary sewing machine. Its serial number is FR 5015870X. The motor # is 85821. The patent on the motor was in oct 25, 1927 by white sewing machine corp. in cleveland ohio USA. The number on the bottom of the sewing machine is 9002-3. Please help me find out what year this is and how much it is worth in mint condition vs not very good condition, or a place in the austin (texas) area to appraise it. Please help 10 POINTS FOR BEST ANSWER!!!