Sterling Silver & Marcasite Brooch Norway Design signed

This stunning Art Deco brooch/pin is still in it's ORIGINAL BOX. It is marked 925 and ND, Norway Designs, according to research. I also think this is a signed piece, but have yet to be able to read by whom. I am having difficulty dating and identifying this piece. Circa 1930-1950's possibly, when "Fine Jewelry" was ONLY purchased at the Jewelry Store! The pictures do not show the true beauty of this brooch, so am showing quite a few. There are approximately one hundred Marcasite jewels, give or take a few. This brooch measures 2 1/4"h x 1 1/2"w. This beautiful cherishable will continue through time on another journey. Why not make it yours?