Wow interesting. Never seen a soprano from Guenot. Shame you didnt get to play itI had one in my hands, yesterday: a curved soprano from the late XIX century. It was descending to B (not Bb) and the owner ruined it by adding an automatic octave key vent mechanism (that sax was born with the double key).
Quite fascinating, but I did not have the opportunity to play it...
The number of makers and retailers in France was huge and like everywhere else there were brands which were producing woodwind and brass but there were many companies which only made one category while sold both and some didn’t make anything and bought them from one of the several dozens of makers.
Most brands where in Mantes but some weren’t, this for example bears the city names Lyon, Paris, Brun-Mandagout and Nimes.
They were mostly known for their brass instruments. In one ad they talk and advertise their simplified system with less keys and screws (maybe the reason of their demise?)
Be careful there will certainly be Pelisson, Guinot & Blanchon which were in HP! ( High pitch!)
Here from the archives of a French collector’s site.
This appears to be a picture of their factory ( maybe a little optimistic? The second one could have been based on photograph and looks a lot smaller
and here the reference to these “ Georgeophones”
They appear to have been something like this
From their catalogue