See John Twitchett and Betty Bailey, Royal Crown Derby, New York, 1988, p. 84-86 for a discussion on Leroy's distinguished career. Désiré Leroy appenticed at the Sèvres factory in the mid-19th century. At the age of 38, he moved from France to take an appointment at Minton. In 1890, he was engaged and given his own studio by Royal Crown Derby Porcelain Company where he remained until his death in 1908.
A contemporary commentator described his work as 'deserving of great praise...These for neatness, delicate manipulation, and artistic refinement, cannot be surpassed, and this is the character of all his work.'
Also see plate 37b & c of the same text for a design of the present model drawn by Leroy illustrating the form both with and without a cover.