Does anyone know the maker of this Norwegian enamel on silver brooch? I thought it might be Ole Olberg, but the mark does not quite match as the four dots in the mark are raised. https://s25.postimg.cc/vebzv094b/P_20180512_185057_edited-1.jpg https://s25.postimg.cc/5vjnhzxa3/P_20180512_185155_edited...