Fr. 222. 1891 $1 Silver Certificate. PCGS Banknote Gem Uncirculated 65 PPQ. Serial Number 7. Courtesy Autograph.Broad margins provide a pleasing frame to this serial number 7 Martha Washington Ace. This Series of 1891 example displays the engraved signatures of Treasury officials Rosecrans and Nebeker while also featuring the penned courtesy autograph of John Burke, 24th Treasurer of the United States, at the bottom right. Burke signed above the engraved signature of one of his predecessors Enos H. Nebeker. The plate impression is dark and sharply detailed with the all-important E7 serial number found printed in deep blue in panels at the lower left and upper right. Clearly saved from circulation as a presentation piece, this $1 Silver Certificate has been remarkably well preserved for the enjoyment of generations of collectors.