Here`s a big denomination note the public was never meant to see! That`s because it was intended for interbank transactions only. Issued between 1929-45, these scarce notes feature a portrait of William McKinley on the face with an engraved back design. Nearly 60 years ago in June 1945, 74% of all $500 FRNs had been redeemed and destroyed. With green Treasury seal and serial numbers, plus Julian-Morganthau signatures.