23rd Congress of the Communist Party of the Soviet Union, stamp of the Soviet Union, 1966, 4 kopecks
Post of the USSR; original uploader was <a href="https://ru.wikipedia.org/wiki/User:%D0%90%D0%BB%D0%B5%D0%BA%D1%81%D0%B0%D0%BD%D0%B4%D1%80_%D0%91%D0%B0%D0%B7%D0%B0%D1%80%D0%BE%D0%B2" class="extiw" title="ru:User:Александр Базаров">Александр Базаров</a> at <a class="external text" href="https://ru.wikipedia.org">ru.wikipedia</a>; re-uploaded by <a href="//commons.wikimedia.org/wiki/User:Penarc" title="User:Penarc">Penarc</a>
1966; 7 July 2007 (original upload date), 2009-02-27 (re-upload date)
Originally from <a class="external text" href="https://ru.wikipedia.org">ru.wikipedia</a>; description page is/was <a class="external text" href="https://ru.wikipedia.org/w/index.php?title=Image%3AXXIV_%D1%81%D1%8A%D0%B5%D0%B7%D0%B4_%D0%9A%D0%9F%D0%A1%D0%A1.jpg">here</a>.