This was published two years before Greater Magic, 1938, p. 478, in de Seive's These Card Tricks, 1936, p. 8, under the title “Contact Card”. Daniel Rhod reports in Notes on the History of Cardsharping in France (2011, p. 24) that using a coin to mark a card with an embossing, used as a cheating method, was described by A. Cavaille in his card sharping treatise, La filouteries du jeu, 1875. Rhod doesn't make clear how the card was used: as a tactile mark or as a means to force or control a cut. Must clarify this point.