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 succesful merger of two smaller silver plate foundries. This company is still active nowadays. 
Marked by the ostrich and two inscriptions "WMF" and "G" (Geislingen an der Steige) in a rhombus, placed in 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.

An extra rare and interesting part of the past. Every day there are fewer of them, suitable as a collection, for a gift or as a good deal in the future.

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