The machine is a replica rebuilt from old photos of the original. The level of secrecy around these machines at the time led to them all being destroyed, along

The machine is a replica rebuilt from old photos of the original. The level of secrecy around these machines at the time led to them all being destroyed, along with all of the plans! This is perhaps more understandable given the UK kept the fact it had cracked the encryption secret and continued to offer similar machines to other states so it could spy on them for many years after the war!