"[1] His Torres-based instruments are historically important, having profoundly influenced classical guitar builders and performing artists of the modern era.
[6][7] Renowned antiquarian dealers Christie's and Brompton's Fine & Rare Instruments regularly offer Hauser Sr. guitars at auction.
[8][9] Hauser's Torres model is "one of the most copied guitars of today,"[10] with master luthiers such as Simon Ambridge (England), German Vazquez Rubio and Brian Cohen (UK), Paolo Coriani (Italy) and Francisco Navarro Garcia (Mexico) among many others, as well as popular manufacturers such as Cordoba, all offering Hauser-inspired models.
Apparently, his earliest guitars were similar to the small French- or Italian-made instruments popular in the 1800s, although he was by 1905 making Viennese models based on the designs of Johann Georg Stauffer.
Finally, in 1937, the builder delivered the instrument that Segovia declared “the greatest guitar of our epoch,” and which now sits in New York's Metropolitan Museum of Art.
Between 1924 and his death in 1952, Hauser built some 250 Torres-style guitars, often designing them to fit specific qualities desired by the customer, as he had done with Segovia.