1912, 1¢ black essay, approved engravers model of engraved incomplete of entire design, retouched in black ink, and mounted on thick gray cardboard, signed "Approved July 17/11 Frank H. Hitchcock" by Postmaster General Frank H. Hitchcock (in office March 1909 to March 1912), Very Fine and unique. Scott No. 405-E1  $5,750. $0 (Image)