The place I stayed at recently had the room lock cut this way

This key looked like hand filed and the room door lock must have had matching bitting, because it accepted the key.

The door did not open without the key fully inserted (did not open with just the tip inserted, or with a screwdriver).

I wouldn’t probably even notice if it wasn’t for the fact that the key could be retracted from the keyhole in any orientation, not only vertically. This is when I noticed the odd bitting.

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