NumberThumbnailDenom.Perf.DescriptionColorNumber ProducedIssue DatePlate Number(s)
C1 No Image Available 6c11Curtiss Jennyorange 12/10/1918Plate Numbers
C2 No Image Available 16c11Curtiss Jennygreen 7/11/1918Plate Numbers
C3 No Image Available 24c11Curtiss Jennycarmine 5/13/1918Plate Numbers
C3a No Image Available 24c11Invertedcarmine 5/13/1918Plate Numbers
C4 No Image Available 8c11Radiator  and  Propellerdark green 8/15/1923Plate Numbers
C5 No Image Available 16c11Airmail Service Insigniadark blue 8/17/1923Plate Numbers
C6 No Image Available 24c11De Havilland Planecarmine 8/21/1923Plate Numbers
C7 No Image Available 10c11U.S. Map and Mail Planesdark blue 2/13/1926Plate Numbers
C8 No Image Available 15c11U. S. Map and Mail Planesolive brown 9/18/1926Plate Numbers
C9 No Image Available 20c11U. S. Map and Mail Planesyellow green 1/25/1927Plate Numbers