Concept car from Italian car company Iso Rivolta. Engineered by ex-Ferrari engineer Giotto Bizzarrini. Fitted with a V8 Corvette engine. Body by Giorgetto Giugiaro at Bertone. This prototype led to the successful Iso Grifo GL (1963-74). (Wikipedia)
Renzo Rivolta also showed a one-off Grifo A3/L Spyder at the 1963 Geneva auto show.
(Photos from supercars.net, autowp.ru, mycarquest.com & flickr.com)