3¢ Globe Prominently Featuring Antarctica – Little America Issue – Issued without Gum.
On sale at the Philatelic Agency in Washington, D.C. from March 15 through June 15, 1935.
As can be seen in the images above, it would be impossible to distinguish the Farley Special Printing from the regularly issued commemorative simply by comparing a single stamp, unless the stamp has a guide-line. The key to identifying this Farley Special Printing is the guide-line between adjacent stamps, in this case a pair with a vertical guide-line between. The difference in shade is incidental.
The 3¢ Byrd Antarctic Expedition II Special Printing was issued without gum and no provision was made to add gum to sheets of this stamp.
This Farley sheet was issued as a sheet of 200 stamps, printed by the flat plate method, with four panes of 50 separated by guide lines. In the very center of the sheet the horizontal and vertical guide lines crossed, creating collectible pairs with guide line between, as well as a center-line block. The margins of the sheets had arrows at the end of the guide lines, creating collectible arrow blocks.