The earliest Nikon rangefinders borrow heavily from both the Zeiss Ikon Contax and Leica rangefinders. Sort of a curios combo of each. The early lenses are based on Zeiss designs.
They're excellent cameras, although I find them to be unnecessarily heavy. The excellent lenses also have considerable weight. I think they weight is comparable to the pre-1945 Zeiss lenses for the Contax -- maybe even a bit heavier.