Hi Ivo,I have seen similar items in Majorca, the Gordiola Glassworks is my bet,it is well worth a visit they will even let you have a go, and they also have a very comprehensive Museum with not only generations of their own glass but also other Spanish glass,i am also convinced it was them who made the enamelled glass signed Royo that many people thought was Moser,i am looking forward to going this summer to have a nose around, if you want to contact them they are in ALGAIDA They also have a showroom and shop just down the road.Regards JP.