Morris used advertisements to promote his bar and invention. The oldest known mention of the pisco sour appears in the September 1920 edition of the Peruvian magazine "Hogar". Another old advertisement appears in the April 22, 1921, edition of the Peruvian magazine "Mundial". In the magazine, not only is the pisco sour described as a white-colored beverage, but its invention is attributed to "Mister Morris." Later, in 1924, with the aid of Morris' friend Nelson Rounsevell, the bar advertised its locale and invention in Valparaíso, Chile. The advertisement featured in the Valparaíso newspaper "South Pacific Mail", owned by Rounsevell. By 1927, Morris' Bar had attained widespread notability for its cocktails, particularly the pisco sour. Brad Thomas Parsons writes that "the registry at the Morris Bar was filled with high praise from visitors who raved about the signature drink."