WWI Eisernes Kreuz zweite Klasse (EK2) / Iron Cross second class MM 'W' (???)

WWI Eisernes Kreuz zweite Klasse (EK2) / Iron Cross second class.In the ring maker marked, but i find it hard to make out. Ir appears to marked with a 'W', flanked by two other symbols? The first time in many hundreths of imperial Ek2's i've encountered this maker.Overal in good condition.