Hi Tigerchips,
The angel mark on pewter, or tin as it is called in Holland ,has never been recognised or attributed to anyone, (although it is snapped up here in Holland for some reason). The early sign for WMF is a runninig "emu". This was discontinued after 1901 (I think...or it could be 1910) with the WMF logo (WMF the letters), whatever, WMF is highly sought after as long as the silver plate is not rubbed, with Art Nouveau pieces topping the list.