Prendeville, J.: Explanatory catalogue of the proof-impressions of the antique gems possessed by the late Prince Poniatowski and now in the possession of John Tyrrell, Esq. (1841): 739
Monson, (Lord)
Christie's, London: June 9, 1851, lot 226
Comments: PONIATOWSKI AND CHRISTIE'S: CHALCEDONY SAPPHIRE