Lara, you should contact the nearest major auction house. They will tell you to vskid like that. Can help to find a contact in /out at the auction house, just tell me how far from home you are ready to go. But at the moment in auction houses in Germany during the holiday season.
Judging from the database -
www.artpreise.com, prices for its ceramics are not high. However, the size works in sales were in times less than yours.