I have a set of 6 serving spoons that I'm suspicious of (germansilver?) that all have this hallmark, NEUS also what appears to be an 'N' with a teardrop above it. Some have an 'O' instead. not sure what that all means. They seem a little thicker then normal coin silver although with that hammered look ... thinner then cast. I've looked everywhere.. I have a few references myself.. no luck at all..