U.S. & Worldwide Stamps & Postal History

1951-52 United Nations 500wn Korea - Italy (without crown) imperforate souvenir sheet of two, blue country emblems (also portions of flags and names of countries) and inscriptions inverted, red portions of flags printed on reverse, suggesting this sheet found its way out of the printers through a back door (printer's waste), some creasing, otherwise fine, very rare and dramatic error, ex-Cunliffe, Sagar collections, with 2009 Philatelic Foundation Certificate
Estimate: $1000