As a result of the Congress of Vienna in 1815, the state border between the kingdoms of Saxony and Prussia was moved in favor of Prussia and initially marked with wooden stakes. From 1828 stone boundary stones were set and numbered consecutively. There are 4 types of landmarks. Up to no. 82, pairs of granite blocks are set, between which a runner stone marks the exact boundary. From No. 82 - 148, truncated pyramids stand directly on the border line. From no.149 onwards, the shapes alternate unsystematically between slender sandstone steles and truncated pyramids. There were colored stones in black and white (Prussian pages) and green and white (Saxon). In other stones the abbreviations K.P. and K.S. struck. Between the larger boundary stones, which were primarily located at junctions, there were smaller stretcher stones that marked the boundary in detail.
When our Saxon King said in 1918 that we should do our muck on our own, the bureaucracy started all over again: now everything that was "royal" on the stones should be removed. The abbreviation K.S. or the crown chopped off, while the Prussians with their K.P. weren't that fussy. In the late 1920s, Saxon mayors and district administrators were urged to finally take action. Fortunately, some officials probably had more important things to do.
See also Wikipedia.