Postal cards with advertising related to library supplies and equipment are among my favorites. This one is an 1899 advertisement for the Marsh Reading Stand and Revolving Book Case which everyone knows was "Recognized throughout the Civilized World unequalled as an Office or Library article." The postal card offers the $7 stand for only $3 "if you will sign, cut off and return promptly the order below." In the statement which you have to sign as part of the order is an agreement to "write half a dozen of my responsible friends, recommending them to order one of you on same terms." Quite a piece of marketing. It reminds me of the over the top TV ads that are too good to refuse.