These Nestlers were all produced in Japan and branded there as “Germany”. Most of them can be found, under other names, in catalogues for different brand/companies. I have their leftmost model in green, and one of the central model (but as said it sports a Mitsu-Bishi logo).
The only “originally and fully German” Nestler MP I know of is their Nestler Kaliber, but it might also have been built elsewhere. That is a completely different story.
Great display nonetheless, it is nice to see so many different colour shades…