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

1926, Project of the King Ferdinand 60th Birthday issue, nine different not approved designs in six different colors, 54 imperforated essays of 10b, 50b, 1L x3, 5L x3 and 10L, printed on thin cards or glossy paper, no gum as issued, all housed on four pages from a Collection, VF and rare assemblage, Est. $800-$1,000