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): 1031
Monson, (Lord)
Christie's, London: June 9, 1851, lot 93
Christie's, London: 27.06.1854; lot 130
Comments: SEVERAL OF THE MONSON GEMS APPEAR IN THE 1851 AND THE 1854 SALE. THEY PROBABLY DIDN'T SELL THE FIRST TIME.