Letter sheet measuring 35x23 inches with printed "SINGLE LETTER, UNDER ONE OUNCE IN WEIGHT." and "To be kept Dry, or the Single Postage will be raised to Fourfold Postage." and a similar sized sheet with printed "POSTAL CHARGES IN 1838" and "This Sheet, 35 inches by 23 inches, weighing One Ounce, is charged as a Single Letter, whilst the accompanying Letter, weighing 7 grains, or under the 60th part of One Ounce, is charged as a Double Letter. N.B. In France, Germany, and throughout Europe, the Postage is charged by Weight", the accompanying tiny letter sheet and enclosure with similarly worded tract pointing out the nonsensical method of calculating postal charges; fine. Photo for one item