A metamorphic library armchair of this design and by Morgan and Sanders is at Trinity College, Oxford and is illustrated in R. Edwards and P. Macquoid, The Dictionary of English Furniture, rev. ed., London, 1954, vol. II, p. 291, fig. 15. A chair of this type was published in Ackerman's Repository in July 1811 and was captioned 'This ingenious piece of furniture is manufactured at Messrs. Morgan and Sanders's, Catherine-St Strand' (P. Agius, Ackerman's Regency Furniture & Interiors, Marlborough, 1984, fig. 29).
Another chair of this model is lot 41 in this sale