Cover with GDR postage meter of Karl Marx University Library in Leipzig, 1977.
German Post; scanned and processed by <a href="//commons.wikimedia.org/wiki/User:%D0%9B.%D0%9F._%D0%94%D0%B6%D0%B5%D0%BF%D0%BA%D0%BE" title="User:Л.П. Джепко">Leonid Dzhepko</a>
1977
Personal collection