My first instinct was that these were Salviati, but after doing some research through my folders, I now think they are most probably Venini. They made a number of ornate table ware sets in the pre-war period as one off commissions with no 2 ever being identical and I feel that these may fall into that category. Records of these are fairly sketchy so it may be ID by a process of elimination, try e-mailing Salviati initially and if that proves negative then I think it strengthens the Venini attribution.
Paul