I got these recently with a bunch of imperial German collar rank buttons but I am not sure what they are. The crown buttons are almost the size of a Sergeantenknöpfe and are marked EXTRA FEIN - common to many German military buttons. The S and 0 buttons are the size of a Gefreiterknopf and the makers mark of the S button is I.O.MAEDICKE BERLIN. Thanks in advance.
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