We said Thank you very much, how much was it again ' She said '£9.50', so we said 'Here's a £10 note - keep the change!'" the BBC reported today, quoting Wetter.The teleprinter, which resembles a typewriter, would have been used to enter plain messages in German. These were then encrypted by a linked cipher machine, using 12 individual wheels with multiple settings on each, to make up the code.The museum has just received one on loan from Norway's Armed Forces Museum, and has a video of how top secret transmissions might have sounded.When volunteers took the teleprinter back from Essex to the museum, they found it was stamped with the official wartime number from the German army that matches the one on the machine from Norway.Andy Clark, chairman of the trustees at The National Museum of Computing, said the Lorenz was stationed in secure locations as "it # was far bigger than the famous portable Enigma machine"."Everybody knows about Enigma, but the Lorenz machine was used for strategic communications," said Clark. "It is so much more complicated than the Enigma machine and, after the war, machines of the same style remained in use."Volunteers are hoping to recreate the whole process on June 3, from typing a message in German to cracking the code using wartime equipment."This gives us the chance to show the breaking of the Lorenz cipher code from start to finish," said Clark. "We can show every single point in the process."But one key part is still missing and volunteers are still searching for it."It looks like an electric motor in black casing with two shafts on each side, which drive the gears of the Lorenz machine," said Wetter.