1928 $20 Gold Certificate Signatures Woods/Mellon Grades vf++. The small size $20 gold certificate was only issued for 1928. Like other twenty dollar bills from the same year, this one shows a portrait of Andrew Jackson in the center of the bill. Once redeemable for gold on demand, U.S. Gold Certificates are among the most sought after of all paper currency. The small-size notes of Series 1928 are much scarcer than previous large-size notes issued over a longer period. Signatures Woods/Mellon. Generally speaking, the 1928 $20 gold certificate is noted for its light pasty seal and a dark green reverse printing.