WALLIS BARNES: (1887-1979) Científico inglés e inventor de la bomba de rebote utilizada en la Operación Chastise (The Dambusters Raid) el 16 de mayo de 1943. Cubierta firmada del Museo de la Real Fuerza Aérea emitida para conmemorar a Barnes Wallis, con una imagen en color de un dirigible R-100 y un retrato de Wallis, matasellos del 15 de junio de 1976 en el número 40. de junio de 1976 en el 40 aniversario del primer vuelo del bombardero Wellington. Firmado por Wallis con tinta azul y su nombre solo en una zona clara. Sobre EX

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.