
Hello.
Those are Italian marks on your box. They have been used since 1999.
The "R" in the box stands for riempito which means filled.
The 925 refers to the fineness of the sheet of silver used to cover resin or a similar material.
The numbers 10 - 13 indicates the amount of 925 silver used to cover the base material.
The letter "g" stands for grams. So, you have 10 to 13 grams of silver on your box.
Don't have any information on Castelloui.
Pat.