Fr. 2109-C. 1950B $50 Federal Reserve Note. Philadelphia. PCGS Banknote Choice Uncirculated 64. Obstructed Printing ErrorA Series 1950-B $50 FRN from Philadelphia with an unusual Obstructed Printing Error on the back. Roughly about 1/8<sup>th</sup> of the design on the right side of the back was obstructed and appears blank. The retained obstruction is included in the lower part of the holder. A fascinating error, especially with the "missing" part of the design included. PCGS Banknote commented "Adhesive Residue" on the back of the holder. PCGS Banknote comments "Adhesive Residue".