Hi. Found this ash tray / trinket dish fairly recently in the North West of England and from the research I've done so far I'm fairly sure it's Czech (I found some being sold on the web as a set of four in a box marked MADE IN CZECHOSLOVAKIA), but have been unable to identify factory or designer. Can anyone help? It measures 11 cm x 8 cm x 3.5 cm (L x W x D) and weighs almost 250 gms. Any help or pointers much appreciated. Thanks