A Munich auction house is going to sell an SG-41 (Hitler mill) at auction. Blog reader Markus Sperl has been on site and has provided me a few pictures of the machine.
The SG-41, also known as Hitler Mill, was the successor of the Enigma encryption machine. Detectorists have now found a specimen in a Bavarian forest.
In World War 2 the Germans used more than a dozen different cipher machines. A few more were developped but not used in practice. This article gives an overview.