[ Autograph ] Guglielmo Marconi 1874-1937 Italian physicist and inventor of wireless telegraphy. I.S.P. 8in x 10in sepia, a fine half length portrait of Marconi in a business suit, seated with one hand in his pocket. Inscribed in Italian at bottom: 'A Guglielmo Potetti sicredo[?] di Guglielmo Marconi New York Ottobre 1929'. Fine condition