This 1907 picture postcard published by E.C. Kropp, Milwaukee, is an early example of the divided back. A few countries still did not permit messages on the back of postcards, so the space allotted to messages was small at first.
This is a colorized version of a black-and-white photo. The printing process used by Kropp and many other postcard publishers of the time was chromolithography. At least five colors of ink were used to produce this card.