Special Delivery, 1908, 10¢ woodblock essay. On yellowish wove card (32x28mm) in green blue similar to #E7-E4, but without framelines and additional faint bluish green background colored in including thin vertical lines in the text, palette and circle surrounding the "10", fresh and Very Fine, a very scarce unlisted essay variety; with 2006 P.F. certificate. Scott No. E7-E4 var.  Estimate $300 - 400. $0 (Image)