, rated "2/-" and increased to "2/8", the address panel shows the rare endorsement "post pd to nyk Doub" applied in Philadelphia, the reverse with unframed "NEW/YORK" handstamp in black. A truly remarkable piece of United States postal history." /> cover 1711 entire letter written by John McWilliam in Philadelphia to<I> "John Brown & Thos. Edgar Merchts. in Liverpool"</I>, rated "2/-" and increased to "2/8", the address panel shows the rare endorsement<I> "post pd to nyk Doub"</I> applied in Philadelphia, the reverse with unframed "NEW/YORK" handstamp in black. A truly remarkable piece of United States postal history. | Christie's