In Germany, 'Dec.' and 'Dc.' were common abbreviations for 'Decor' (today 'Dekor'), but it could just as well be French (similar term). Anyway, the mark stands for 'decoration 1332'.
These dual-material marriages (metal / stoneware or metal / porcelain) were created by many *metalware* companies in Germany, e.g. the company of Max Dannhorn or the Wuerttembergische Metallwarenfabrik (better known as 'WMF'). One therefore should always check for marks on the metal pieces as well as those companies had agreements with various suppliers like Villeroy & Boch, Schramberg, Annaburg, etc. - many items attributed to certain *ceramics* manufacturers actually were created by certain metalware factories instead. Prices vary accordingly and can not be compared with unidentified marriages.