40004844, Marlborough, 338, Omphale, shouldering Herakles' club and wearing his lionskin., Gulbenkian Museum, Lisbon, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), 2726, Amethyst

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