Hi the original has Balfour on the back. I've had quite a few of them and they have always had this mark, with the screw back post. A good reference tool is on Presspins. com. If you go to the bottom of the page you will see a link that says press pin info. Click on that and it will led to a link that shows a photo of the front and back of all press pins. Press pins are kind of tough as some of the pins do not have any makers marks.
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