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This door uses a locking mechanism patented by Swiss bank locksmith Bauer AG in 1919. The mechanism prevents removal of the lock even when the door was open unless you had a special 'Director Key' which operated a secret bolt inside the lock. Very secure!
On some of the earliest doors we found in the vault, each mechanical part was numbered by hand. For instance on door 374, we found the number 3-7-4 hand-stamped on the door, hinges, secret bolt, etc..., as many as 11 markings per door. These extra markings are found only on some doors and we put a special mention in our price list for these exceptional doors.
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