The Royal Porcelain Factory in Berlin, also known as KPM for Königliche Porzellan-Manufaktur Berlin, was founded in 1763 by King Frederick II of Prussia (known as Frederick the Great). Its actual origins, however, lie in three private enterprises which, under crown patronage, were trying to establish the production of “white gold” (i.e. porcelain) in Berlin from the mid-18th century onwards. Porcelain from this factory are often called Berlin porcelain. Reference: Wikipedia
Below are some examples and price guides of Royal Porcelain Manufactory KPM antiques including an example of the KPM maker’s mark and a pair of wall lights.