Physical description: Two distinct areas of different density (darker / lighter) clearly delineated by a straight line
Inscription: Pencil rule line along one edge, recto; in turquoise ink, verso, 1" or 2" Dec. 17/40 cloudy not fixed [1 or 2 minute exposure - 17 December 1840 - cloudy - not fixed]
Owner:Smithsonian Institution's National Museum of American History