Skinner was Commissary General of Prisoners between September 1780 and the end of the war; letter, therefore, was written after 15 Sept. 1780.
Concerns the bearer, one Robert Weyman, "lately from New York and who ... has thought proper to leave the enemy...."
Watermark of Truman and Company -- see Gravell, American watermarks, no. 178, figures 471 and 635
Watermark: T & C ; countermark: plow