Stanley NOS FACTORY WARNING PLATE?? SEE DETAILED PICTURES BELOW DESCRIPTION. Here is a Vintage Stanley Tools Very Rare Sign Advertisment Factory Plate Brass? I do not know what this is for? My best guess is maybe it went on a machine in the old factory to prevent accidents? Extreamly rare and scarce I have never came accross one! It Measures 2 1/2″ x 1 1/8″. Need I say More Its Unused. Any questions just ask.