Styles of Jail/Prison Keys

Hi All,

I have a few Southern Steel and Folger Adam lever tumbler jail keys in my personal collection that look something like these:

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also have a blank Southern Steel as well.

Does anyone know when these keys were first produced???

The Folger Adam key with the 'A' in an oval ring are still being made, while the Southern Steel with the 'SS' have been replace by this style (which I don't have in my collection):

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More information on the styles would be appreciated. Thanks,

C.W.

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