handstamp on folded letter to New York City datelined "Lisbon, the 10th May 1785", postmarked upon arrival in Newport, Rhode Island, rated "4" [dwt] and marked "Sh" as a ship letter (postage was 3dwt 8gr plus the 16gr ship fee for the total of 4dwt), converted to local currency (2sh) in New York, fine and rare, only two or three examples of this postmark are recorded (ASCC $1,750)