The Giulietti Accordion Co. was founded in New York in 1923 by Luigi Giulietti. Giulietti was born in Recanati, and emigrated to Chicago in 1914. The company was taken over by Luigi's son Julio following the death of his father in 1950, and the name changed to Giulietti & Son Accordion Co. The Zerosette company made accordions for Giulietti & Son so when Giulietti decided to sell guitars they turned to Zerosette for manufacture. Giulietti guitars and effects were sold under the JG (Julio Giulietti) and Juliett brand names. There were also Giulietti amplifiers. The Giulietti Accordion Corporation was active until at least 1984, at which time it was located in Westfield, Massachusetts. In 1996 Julio Giulietti died but in 2010 the Giulietti brand was revived by Petosa.

Source: Fetish Guitars - Zerosette

Source: Petosa website