Pair of 18K (750) gold buttons, each adorned with an agate cameo carved with Poseidon surrounded by his retinue of mythological characters and creatures, the mounting finely pierced with messages hidden in foliage: "Souvenir d'amitié" and "Dieu nous garde". Work from the second half of the 19th century. Diameter: approx. 2.5cm. Gross weight: 11.3g A late 19th century pair of Poseidon buttons