Hi Martin. There's a whole bunch of these matching bowls and plates shown in the book "Venetian Glass - Confections in Glass" p84-85, in lots of different lovely patterns. This particular pattern isn't shown there, but there are plenty with this same shape, so I am pretty confident they are the same make.
Some of the plates, without bowls, are also shown in the book "Italian Glass - Century 20" p139, which dates them to late 19th or early 20th century as you say. Both books attribute these to Salviati. Hopefully :X: they are not both wrong!