Lot 31991861 (Aug. 13) Philadelphia Pa. to Liverpool, England, cover bearing 24¢ gray lilac (37) cancelled by grid and tied by light "Phila. Br. Pkt. '10' Aug 13" debit exchange cds with 10¢ debit for double 5¢ U.S. inland, matching "Insufficiently Pad" oval handstamp, underpaid double the 24¢ treaty rare by 24¢ so treated as unpaid, carried by Cunard Africa from New York Aug. 14th to Liverpool arriving Aug. 25th, Liverpool (8.25) arrival cds and "2/-" due handstamp for double the 1s packet rate.
Estimate $750 - 1,000.
Under the treaty, partially paid letters were treated as wholly unpaid, with the full rate due on arrival. No fines were applied.