The Italian flutist Tebaldo Monzani established a very successful flutemaking firm in London, circa 1800. The year 1808 marked the beginning of his twenty-year partnership with the instrument maker Henry Hill. As Monzani & Co., the two produced a wide variety of finely crafted and innovative flutes. When Monzani retired in 1829, Hill continued alone, later making his sons partners, until the firm's stock was finally sold at auction in 1845. This article seeks to establish a chronology of selected extant Monzani and Hill flutes based on the serial numbers, hallmarks, and the form of signature and street address found on the instruments.