Very Rare WWII Enigma Cipher Machine. This highly important three-rotor Enigma deciphering machine was used by the Nazis during World War II. It is believed that acquisition of an Enigma, and the subsequent deciphering of the German codes by the Allies, shortened the war in Europe by at least two years. Examples of Enigma machines are exceptionally rare and almost all known models are in museums.
HMS Glorious in 1918: prohibited from ordering anything larger than light cruisers, the Admiralty came up with an extraordinary class of what were in effect light battlecruisers, mounting 4 x 15 in guns and very lightly armoured. The compromises were too many, and all 3 swiftly became carriers post WW1. Glorious was sunk by German battleships Scharnhorst and Gneisenau off Norway in June 1940.