Color Change Post Card - Look at this card sideways

Front:
IF MORE THAN SIGNATURE IS WRITTEN BELOW, TWO CENT STAMP MUST BE USED LOOK AT THIS CARD SIDEWAYS, FIRST FROM ONE SIDE, AND THEN FROM THE OTHER PATENTS APPLIED FOR H. C. J. DEEKS & Co., PATER8ON, N. J. Colorchange Post Card

Back:
POST CARD PLACE THIS SIDE FOR THE ADDRESS STAMP HERE