Much has been written about Mario Maccaferri but we would like to present a few articles of interest.
Metropolitan Museum of Art-Guitar Heroes Exhibit(2011)
Chitarra-lyra-or-harp-guitar-1915 by Luigi Mozzani (Italian, 1869–1943) instructor of Mario Maccaferri
Harp Guitar Player of the Month-Mario Maccaferri
From www.lutherie.net. Excellent information about the Selmer Maccaferri Guitar
Checklist of Plastic Instruments