Royal Porzellan Manufaktur G.m.b.H
Küps (Bavaria)
Hersteller / Manufacturer
Known dates: 1955 until 1996
References: Porcelain Marks & More
CO 71 Hunter Rabbit, this version with monocle. This is a reproduction of ECS 63/64. There is also a version by Rastal as well. 
R.P.M. green ink stamp on Hunter Rabbit stein. This mark was used between 1955 and 1973. 
Ink stamp mark on later puzzle mugs. This mark was used between 1973 and 1996. 
Small cobalt blue glazed stein with pewter lid, dated between 1973 and 1996.
Genuine Cobalt glazing, basemark on the above stein. 