Hoosier Cabinet of unknown maker and age

We bought this from an individual in New Orleans a few days ago.  It is in great shape, all we did was rub it with some wood oil.  We can't find any makers marks and can't seem to accurately date the piece.  It has a flour sifter and the work table top is made of metal.  Not sure if it is tin, zinc or something else.  Also, it has wooden side brackets where the table slides out instead of metal brackets.  Any help would be appreciated!  Thank you very much!!

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