I have had a fruit bowl of opalescent glass for some years. It is 32 cm in diameter and has a bird pattern with cherries and grapes. The base is old stainless steel in a stepped pattern with a central conical 'screw'. Today whilst admiring it in the sunlight I noticed some markings on one of the logs that the birds are sitting on. It says: F Zan (underlined) France or it could be E Zan with the base of the E being the underline. Does anyone know what this means? All the best - Colin