U.S. Sanitary Commission.
Imprint on cover mailed locally in Washington with single fancy geometric cancel,
no stamp or other markings, Dec. 1862 enclosure headed 9th Army Corp Hospital with interesting contents: "F.A. Eliot was perfectly safe - after behaving in the most glorious gallant way - leading his men like a lion."
etc., Fine, very scarce drop usage
Power Search for Comparables