$50 1977 FRN DARK OFFSET PRINTING ERROR on SCARCE DENOMINATION! PMG VF 30

Without much effort a collector could locate and purchase a $1 partial offset error to add to his/ her collection; however, it would take considerably more effort and time to purchase on a $50. This is a tough denomination to locate an error -- especially one this obvious and dark -- with more than half the back design appearing as a mirrored image on the face.  Secure this popular error on a scarce denomination!