Soviet Union 1925 (February 28), 7k-40k, imperforate Lenin Mausoleum set together with typo printing definitives of 1k (3) and 2k vertical pair, perforation 14 1/2×15, plus Lenin Mourning stamp of 3k, used on registered cover from Rostov-on-Don to Riga, arrival”5.3.25” ds on reverse, vertical fold did not affect the stamps, fine and an interesting cover […]