JR Stewart had worked for Harmony in the 1920s before starting his own business in 1925. In 1928 Stewart bought the rights to manufacture Washburn instruments from Lyon and Healy. JR Stewart also made instruments under the Le Domino, June Days and Hula brand names. Regal took over the Le Domino brand in 1930 following the bankruptcy of JR Stewart, and made Le Domino instruments for a while.

Source: Fretboard Journal. Catch of the Day: Catch of the Day: Circa 1939 Regal Le Domino Big Boy. July 2014

Source: Banjo Ukes - J. R. Stewart Company (12 December 2017)

Source: Lardy's Uke database - JR Stewart (12 December 2017)