Hello! I have this art nouveau tray marked «WMFM», «1/0» and «OX». It is engraved, has motif of dragons, and it almost reminds me of a Viking ship with shields on the sides. If someone could help identify the markings, say something about the age and value, I would be very happy.
Not much help here, but the “B” (or possibly “R”) is just an engraved monogram, probably of the person that had it. To me it looks more Art Deco than Nouveau.