The penalty for counterfeiting and forgery of banknotes (imprisonment at least two years) appeared about the higher correct corner of the reverse of all 3rd collection banknotes. Note This can be the publish-1970 variant, that includes "Freiheitsstrafe" rather than "Zuchthaus". Usual security measures at some time were guilloches, a multi-level https://wardy974ucl2.wikilinksnews.com/user