3¢ Federal Building in Chicago, Illinois – Century of Progress – Pane of 25 – Issued without Gum.
On sale at the Philatelic Agency in Washington, D.C. from March 15 through June 15, 1935.
It would be impossible to distinguish the Farley Special Printing from the regularly issued commemorative pane by examining individual stamps, unless the stamp or pane has a wide margin. The distance between the stamps in the pair shown is 13 mm. This pair can only be the special printing since a pair with this much spacing between stamps cannot be made from the originally issued panes. Any difference in shade is incidental. To see other examples of position pieces that positively identify the stamp as being from the special printing, click here.
The special printing of the three-cent Federal Building, Century of Progress stamp was issued as a full sheet of 225 stamps. It was printed by the flat plate method, with 9 panes of 25 stamps separated by 13 mm gutters. The stamp is often collected as a pane of 25 stamps to retain the marginal markings of the originally issued souvenir sheet. In the case of the illustrated pane below, there is a wide margin present and it can only be the Farley Special Printing.