Auction #93 Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World

1917, World War I Propaganda Forgery of money stamps, 20k olive green and 15k orange brown, set of two stamps, inscriptions on reverse reads: 20k - ''In circulation on a par with bankruptcy of silver coins'', 15k - ''In circulation on a par with robbery and cheating rulers'', unused without gum as produced, VF and very rare, Est. $800-$1,000