This is certainly a stenciled saxophone, wehther French or not may depend on its features (which unfortunately aren’t visible by the pictures).
Paul Cavour saxophones aren’t rare, especially in England (we’ll see why), any search on the internet will reveal many of them, and will also reveal a lot of speculation on their origin
Incidentally
There have been previous threads (as almost always is) and I suggest in future to continue one such old thread (even though old) because it may return more information ( members still active will receive a notification and they are obviously interested and may have information) while keeping information in one place. Pictures of those older posts are unfortunately, gone
The pictures that I can find around the net of Paul Cavour Horns may often point to a French origin (after all they had lots of makers over there), but there were some of these made in Italy (at least one auctions calls “ Italian”) and since some explicitly say “ Made in Italy”, we can be certain that Paul Cavour ( if there ever was a person with that name or maybe the brand was inspired by Camillo Benso of Cavour, first Italian Prime minister)
An analysis of this “ brand” was made on the blog of the French Collectors of Brass and Woodwinds
-Invicta- Paul Cavour- Paris Model- -Paul Cavour-Invicta Model-Made in Italy- Source Ebay pseudo shresthakimi Ce n'est pas le p...
luthiervents.blogspot.com
There are Pierret, Lyrist or Rampone & Cazzani attributions so, we know, for sure that these two avenues are the possible ones, there may more!
Horn-U-Copia shows a Paul Cavour MILAN trumpet
so, despite the Paris (model) designation Paul Cavour may have been an Italian brand
Photos would be good. These turn up on eBay from time to time, but apart from the fact that Paul Cavour was Milan-based, I can't add anything to dr.jazz's comment. The fact that it's marked Paris suggests it's a stencil, so photos could help identify the maker. The info re the bell orientation rings a vague bell - have you checked SaxPics?
I would suggest to place an inquiry with Claudio Zolla at Rampone & Cazzani, they may actually know (although their knowledge of these things may be simply anecdotal since the company went through different ownerships through the years while loosely staying “ within the family” )
Just to give an example, this “ Paul Cavour “ saxophone ( different from yours) is CERTAILY a Rampone & Cazzani made one
Pointers in this direction are also found here where they clearly link the brand to Rampone & Cazzani and to England (which explains also many being found there)
a little story of the c tenor saxophone - Ton Verhiel, musicianwww.tonverhiel.nl › uproc.php