The numbers on back are usually only helpful to the company !! The 26 is the plate size in cm !! Slightly over 10 inches !! The 046 may be the number of items in a basic set,,serving pieces then bought separately !! Your plate was made after 1931 and before 1953 !! That is about as close as we can get since they may have produced this plate more than once depending on its sales record !!