1857, 1¢ blue, type IV, right centerline margin block of four, on reverse of 1857 folded letter sheet to Nantes, France, tied by "Charleston S.C. Dec. 1857" cds's, additionally franked with 1857, 3¢ rose (25) on address side; two stamps have been removed from front and some minor gum soak in block, otherwise Fine, ex Waterhouse. Scott No. 23  $25,000 off cover. ONE OF THREE KNOWN USED BLOCKS OF THE 1857 1¢ TYPE IV AND THE ONLY KNOWN BLOCK ON COVER. $0 (Image)