Hi,
What you have is a resin base covered with a layer of silver. To identify such pieces and so that they are not to be confused with solid silver items, as they do contain a full set of Italian marks, the Italian government required some extra marks to be struck. These extra marks are a 'R' within a square, this stands for 'Riempito' (filled), and also a set of figures that indicate the amount of silver applied, in grams (1÷2 g, 2÷3 g, 3÷5g, etc.). These are not exact weights, but must fit into range stated by each mark. In your case the handles contain between 20 and 25 grams of silver.
For details of the maker, A. Cesa & C., see:
https://www.925-1000.com/forum/viewtopi ... sa#p131908
Trev.