Friedberg 1173m. 1922 $10 Mule Gold Certificate. PMG Gem Uncirculated 66 EPQ. John Burke back plate #117 is displayed on this excellently printed and well preserved Speelman-White signed 1922 $10 Gold Certificate Mule. The same back plate was used on earlier $10 Gold Certificates of the Series of 1907. Just 91 of these mules have been graded by PMG with this example being tied with two others for finest graded. Brilliantly colored inks are seen in the overprint and back design. Plentiful margins are featured and the centering borders on Superb.