According to my Leica Pocket Book (Hove, 6th edition, 1994) Leica 352011 is a Leica II, manufactured in 1940. "D.R.P." stands for "Deutsches Reichs Patent". After the Third Reich went under in 1945 it became "D.B.P." or "Deutsches Bundes Patent".
FWWI, so there is no misunderstanding, D.R.P had nothing to do with the Nazis. It was the official German patent registration from the 1870s on and antedated the so-called Third Reich.
John, Mount Vernon, Virginia, USA
I know, and I wasn't trying to imply that D.R.P. had anything to do with the Third Reich. It's just that the term "Reich" was somewhat tainted after 1945 and Germany became a federal republic, hence the Bund/Bundes.
The fall of the Third Reich did not necessarily go along with the fall of all the `Reichs-´ designations of nationwide departments. In the GDR the term Reichsbahn (for their national Railway System) survived till the end.
Further I assume that a Reichspatent kept its name even under a new Patent department.