According to
http://www.carsfromitaly.com/others/index.html , Carrozzeria Touring was being placed in receivership in 1964 with production ceasing in January 1967. Other sources say the company ceased its activity in 1966 or 1978. 1966 or 1967 is probably correct, as Carlo Felice Bianchi Anderloni, the son of one of the founders of Carrozzeria Touring and head of the company until it went out of business, went on to work for Alfa Romeo, first as advisor and then as person in charge of the design department. I don't believe the Superleggera name or badge was ever used again after Carrozzeria Touring went out of business.