Set of 2 Stereo Cards Card No. 30 (a) "Eavesdroppers" Card No. 31 (b) "Eavesdroppers Dropped" May be Ingersoll, but not marked. This type of stereograph (Lithograph printing) became common after 1898 and, because it was simply run off on a commercial press, could be sold for next to nothing. Sears, Roebuck's 1908 catalog offered 100 such views for eighty-five cents. For $1.00 you could have the 100 views plus a stereoscope.