Unused Curteich-Chicago C.T. Art-Colortone linen card 4B-H721 (DR-10, or DR-18) whose black cptions on a dark background make no sense to us.  The card, though, is in great condition for its age — and Datura arborea seems often confused with Brugmansia arborea.  Not by us:  we had not heard of either one.  Grade: 1