Italian aeronautical engineer and pioneer in Arctic aviation who flew over the North Pole with Amundsen and Ellsworth in 1926, completing the flight from Europe to North America. Commemorative cover, 6.5 x 4.5, with a cachet honoring 25th anniversary of the Royal Air Force Hospital Nocton Hall, signed in black felt tip, “Umberto Nobile.” In fine condition, with uniform block of light adhesive toning at the lower right corner. Accompanied by two unsigned photos. RRAuction COA.