Fr. 375. 1891 $20 Treasury Note. PMG Gem Uncirculated 66 EPQ. A visually stunning $20 Open Back Treasury Note. Seen with an open back format for the 1891 series which replaced the "busy," ornate backs of the 1890 series. This was primarily done for counterfeiting issues and was adopted in style by several other types. Depicted at left is Chief Justice John Marshall. Always in demand at this grade level.