40002306, Poniatowski, 1839-1813, CONSTANTINE THE GREAT, KON, Unknown, The Wellington Gems (1977) [London, Market, S.J. Phillips], Mr. Phillips, Auction Offices, 73 New Bond Street, London, Northwick, Worcestershire, Christie's, London, Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), 422.2, Cornelian