The guitar heard on Brazilian bossa nova recordings is most often the DiGiorgio Serie Artistica model. Here, Mimi Fox plays “Triste” on a 1965 DiGiorgio Serie Artistica Autor No. 3, one of 27 instruments offered in the Acoustic Guitar Auction that begins May 13, 2021.
The Autor 3 was the workshop's top-of-the-line model and was the guitar of choice for such bossa nova innovators as Antônio Carlos Jobim, João Gilberto, and Baden Powell.
This instrument was built by Reinaldo di Giorgio in 1965. Among its distinctive features are round brass tuners decorated front and back with mother-of-pearl.
https://store.acousticguitar.com/collections/may-2021-guitar-auction