If I was any more excited about this one, I would faint: The New York City post office on a reproducing postcard. First copyrighted as novelty items by A. Loeffler in 1895, these cards had a simple image printed and then embossed from the back. The card had printed instructions advising that a piece of paper be placed over it and a soft pencil or crayon rubbed over; in this way the image could be duplicated. My thanks to the Metropolitan Postcard Club of New York City for the information on Loeffler and his reproducing postcards. For more on this magnificent post office, visit this earlier entry.