Nikon member Joe Higham produced an extraordinary series of drawings for the NHS which showed the Nikon M-S series in great detail. The article was published in installments, the drawing and PDF (the complete article) are from part 3 in the series.
The series included more than just illustrations, but provided a manual on how to service these cameras, in detail that was never provided in any official manual. The drawings are quite beautiful, reminiscent of classic product illustrators like Daniel Rebour.
