Trivet and two bottle coasters

Charming set consisting of a trivet and two bottle coasters in glazed ceramic in a beautiful emerald green color typical of the 50s. The motif representing three dolphins is unusual. Underneath, several markings but none that allow me to determine with certainty the origin of this set, but it is in the style of the productions of saint clément or vercéram for example. The set is in perfect condition, no cracks or chips, the only signs of use are tiny scratches on the body of the dolphins on the trivet or on the edge, these three elements have probably been used very little. The trivet measures 21 cm in diameter and 2.5 cm in height, the bottle coasters measure 12.5 cm in diameter and 2 cm thick.