The marking on the back says "HORSTMANN BROS & CO / PHIL".
It has a dot between the "h" in Horstmann and the "p" in Phil. The dot after "Phil" is lower than the dot next to the "p", more towards the edge of the button. It doesn't even look like a dot more like some tiny little marking I can't make out.
I bought them as a gift for my father so he could make cufflinks out of them, our last name is Horstmann with two "n's".
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