1934, 5¢ Yellowstone National Park, horizontal pair, imperf vertically (Scott 744a), o.g., previously hinged, wonderfully fresh with guideline at right; natural paper/gum wrinkle on right stamp (not mentioned on accompanying certificate), Fine to Very Fine, only 50 pairs recorded, with 1997 P.F. certificate. Scott $1,500 Estimate $750-1,000 (Image)