English: Cherrystone Auctions note: "SOVIET UNION 1932 - the unique souvenr sheet of four 1932 All Soviet Philatelic Exhibition in Moscow, souvenir sheet of four on thick card, with the unique three line personalized overprint "To the best shock worker of the All Russian Philatelic Society - President of the Moscow Philatelic Organization E.M. Nurkas", unused without gum as issued, v.f., signed "Shtern". While 25 souvenir sheets were overprinted with the two line "To the best shock worker of the All Russian Philatelic Society", three were additionally personalized with a three line overprint. One was given to the notorious Genrikh Yagoda (head of the NKVD), and one each to the presidents of Moscow (Nurkas) and Leningrad Philatelic Organizations/Societies. The latter, as well as Yagoda were executed on Stalin's orders, with only Mr. Nurkas (and his souvenir sheet) surviving. During the purges, Mr. Nurkas was imprisoned and traded the sheet with another inmate, a physician who miraculously survived Stalin's Gulags and World War II. An important piece of history and perhaps the greatest rarity. Price Realized: $675,000.00."