At CBN, we take good deal of care with client keys. We don't want any identifiers on the keys that would point to the client's building (name, address, logo); we also want to be able to tell the keys apart, both as to which client the keys belong to and, if there are more than a couple of keys associated with that client (say, front door, interior master, janitor closet, executive office), which keys fit which doors. So, we assign a number code to each client, and don't allow our crews to associate that number with a client name or address, and a letter code to each key on that client's ring, to avoid confusion on what key fits what. We stamp both on each key.
Until chancing across this video, I'd not wondered what a warship (say a battleship) might have in the way of keys, and how they are kept secure and each identified. Turns out, there are a LOT of keys - on the example, 88 just to engine room gear reduction boxes (you don't want someone to open up a port and drop in, say, a wrench). Each stamped with a padlock number (a bit similar to what we do), and all kept secure.
Enjoy!
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