This armchair is based on designs for a "French chair" as seen in Thomas Chippendale's "The Gentleman and Cabinet-Maker's Director", 2nd ed., 1755, pls. XVIII-XX.
See also:
Geoffrey Beard and Judith Goodison, eds., English Furniture 1500 - 1840, Oxford, 1987, p. 129, fig 5
Herbert Cescinsky, English Furniture of the Eighteenth Century, New York, n.d., vol. II, p. 95, fig. 93
Anthony Coleridge, Chippendale Furniture, 1968, fig. 189
F. Lewis Hinckley, A Directory of Queen Anne, Early Georgian and Chippendale Furniture, New York, 1971, p. 165, fig. 248