This machine could be a non-military commercial model that Enigma was selling by 1920. I really like these old mechanical or electo-mechanical computers, my favorite being the fire control computer on the Iowa class battleships for the 16" rifles. It was not replaced during the re-fit of The Big Stick, as it was not going to be affected by EMP. So if the balloon went up, that old analog Iowa could still send 1 ton shells over the horizon, very accurately.