[Leica] shuttertest

[Eddy Willems]

/I/'m  working on a book about light in photography

and I'mlooking foran article about the shutter speed test;
I have now received more information,
the article would have appeared in the Leica magazine at the end of the 
1960s and early 1970s,
the test would not have been done at the fotokina but in clubs and 
associations,
would it be possible to get a PDF of this article,

Thank you in advance for your cooperation
Regards
eddy willems