The penalty for counterfeiting and forgery of banknotes (imprisonment at least two yrs) appeared over the upper proper corner on the reverse of all third series banknotes. Note This can be the post-1970 variant, featuring "Freiheitsstrafe" as an alternative to "Zuchthaus". Common security measures at time were being guilloches, a https://chancerutrp.thechapblog.com/26215424/manual-article-review-is-required-for-this-article