Dia.: 13,7 cm (the saucer)? Dia.: 9,1 cm - H 5 cm (the cup)? Inscribed 'Gardes vous de la syrène' which translates to 'Beware of the sirens'.? See also: The British Museum, Museum Nr. PDF,B.651, for a similar cup and saucer on loan from the Percival David Foundation. (link)