The reverse of the coin presents a stylized image of a postal bishop from the 16th century. In the background there is a fragment of copperplate from the 17th century with the image of an inn and the image of a postal trumpet. On the obverse there is an image of a postage stamp showing images of a bishop on a horse playing the trumpet and trees changing colours depending on the angle of view.  As in other countries, the post office was initially associated with the ruler and the court. Kings and princes used messengers, called bailiffs, to carry correspondence.  A fundamental change in the organisation of the post office was introduced by Władysław IV. In 1647 he issued a postal ordinance, which became the foundation of the post office.  The post office gained great importance after Poland regained its independence in 1918. The Decree of the Head of the Post Office of 5 February 1919 established a separate Ministry of Posts and Telegraphs, which made it possible to quickly unify and develop a coherent communication system. This was extremely important in view of the difficult situation of a country recovering from the destruction.