MARCONI, Guglielmo, letters, autographs, documents, manuscripts Home | Archive | Facsimiles | Forgeries | Back MARCONI, Guglielmo (1874-1937). Pioneer of radio. Signature in ink ('yours truly / G Marconi') written obliquely on a small card, undated. [No: 7775] This is the archived description of an item that has already been sold. Please contact me if you would like any further intormation.