Thanks for your patience, Marguerite, I just had to check a few details before I could give you a meaningful response.
These sets by De Uberti were all silverplate, I'm afraid, not sterling. They were imported to the US in the 1950s - 1970s and marketed by Gorham.
If they were sterling silver they would either have the word "STERLING" or they would be marked with the silver fineness number, in this case .925 or with a star, a number and a province abbreviation like this which are the conventions for the marking of Italian silver.
As such, your boxed set would therefore have a secondary market value (at auction or on line) in the range of $80 - $120.
Full retail/replacement/insurance value: $240.
I do hope this helps!
PS You will not be charged anything unless or until you accept my answer, except for the good faith deposit you made (which is also refundable on request). The total cost to you (including the deposit) should you accept my answer, will be $38.00. I hope this makes sense. R