Harry Peckmore Engraving - Provided by H. Lindquist as premium for subscription to Stamps Magazine
Scott 741P2 Small Die Proof - Courtesy Harmers International Sale 8, Lot 24 of May 12, 2017
Scott 741a - Horizontal pair, imperforate between vertically. William S. Floyd Collection Sale, Shreves Philatelic Gallery - October 23-25, 2001 - Lot 887
Scott 741b - Vertical pair, imperforate betwee horizontally. William S. Floyd Collection Sale, Shreves Philatelic Gallery - October 23-25, 2001 - Lot 886.
Scott 741 - Imperforate Sheet, Signed by PMG Farley (courtesy Smithsonian Institute, National Postal Museum)