40001485, Poniatowski, 1839-309, SLEEP, HEAD, WITH AN OWL, ARGHOS, Argeos, Unknown, The Wellington Gems (1977) [London, Market, S.J. Phillips], Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), Christie's, London, 418.4, Sardonyx

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