Can you post a better focused image of this new marks set? The center
symbol really needs help. These *may* be Norwegian on the strength of
the NM mark (which on Norwegian pieces designates that the design is
registered, like patented in other countr...
It's not a "hallmark" just a maker's mark. Silver plated at best and
made by Arthur Krupp. Scroll down to the bottom right of this page to
see info and examples. https://www.925-1000.com/silverplate_K.html
