This is one of my favorite old locks, used to secure registered mail containers. It can be picked, but that’s not the main security function. It has a counter that advances whenever it’s opened, making it difficult steal mail undetected. It’s essentially a re-usable seal. pic.twitter.com/q9IzoPtQEu— matt blaze (@mattblaze) February 6, 2019
Monday, February 25, 2019
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