RARE of WMFG Art Nouveau Britannia zinc-antimony-copper Liqueur Jug 1890 - 1900s WMF is the abbreviation for Württembergische Metallwarenfabrik, which means Württemberg Metal Factory and was created in 1880 in the small town of Geislingen on the river Steige (Geislingen an der Steige), after the successful merger of two smaller silver plate foundries. This company is still active today. Marked by the ostrich and two inscriptions "WMF" and "G" (Geislingen an der Steige) in a rhombus, placed in a hatched rectangle. Note the special shape of the "F" letter. The rectangle size is 3.7 x 4.2 mm (or 3.7 x 4.4 mm). The additional marks: "B" means Britannia metal(rare), a zinc-antimony-copper alloy which served as a base metal for silver plating, "I/O" means normal silver coating which is equivalent to 1 gram of silver per 1 dm2 of base metal surface. This mark was in use from around 1900 until about 1918.