Famed Italian tenor (1873–1921) whose unprecedented popularity, which extended well beyond the rarefied realm of opera, made him the first superstar of the recording era. ALS in Italian signed “Caruso,” on a 5.25 x 3.25 picture postcard of the Equitable Building in New York, postmarked 1918. Caruso pens a brief message to Umberto Sorrentino. A touch of mild soiling and handling wear and a few small creases (mainly to address panel), otherwise fine condition. R&R COA.