Trick locks have been around for centuries. Generally they require some special knowledge in order to operate them and they were used most often with warded locks because the mechanism was so easy to compromise. Generally there are special buttons to push, pull or slide to reveal a keyhole, or many require the use of different keys in a specific order and can be quite a puzzle to open even when all of the keys are available. An irresistible enigma to many, I have a couple on my desk that I won't show the secret to unless you declare that you give up.
||A Sinclair trick lock with a single trick, button on the bottom is pushed to release keyhole cover on front.|
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