Ключевые слова: 1921, 1961, aged, anniversary, antique, balkans, bani, black, canceled, closeup, collection, communication, communism, communist, correspondence, engels, europe, european, flag, friedrich, historic, ilyich, karl, lenin, letter, mail, marx, old, party, philatelic, philately, post, posta, postage, postal, postmark, red, retro, romana, romania, romanian, romina, seal, sello, selo, stamp, timbre, used, vintage, vladimir,