The three letter code is the US import code denoting the US importer or US subsidiary of a foreign manufacturer. I believe that OXM is the import code for "O. Maire Watch Co" or "Manufacture d’Horlogerie Otto Maire SA" of Longeau, Switzerland. An (incomplete) list of US import codes can be found here:
http://www.ranfft.de/uhr/info-uscode-e.html
Can we please see the front of this watch?
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