Each product has been marked at the bottom or at the back with a trade mark. You can findthe different Royal Delft trade marks here.
Since 1879, each hand painted article produced by Royal Delft has been marked with a letter code. Using the list year codes you can find out yourself in which year your Delftware was produced.
Each product which carries our trademark is provided with a certificate of authenticity. With this certificate, Royal Delft and the Chamber of Commerce guarantee that the product has been completely hand painted according to a centuries old tradition.