Fr. 2073-B. 1981 $20 Federal Reserve Note. New York. PCGS Choice About New 58. Obstructed Back Printing with Printed Fragment.，A terrific obstruction error which retains the piece that caused the misprint. A stray piece of paper adhered to the back of the sheet prior to the first printing resulting in this obstructed print error with the retained obstruction. A scarce error which will surely grab the attention of advanced error note collectors.
