this is not a Selmer ( the picture is of the “ logo” is from a mouthpiece cap indeed! How can you not tell?), nor is a prototype of anything or a saxophone shaped object.
It is short range European (Probably French or Belgian) saxophone and in all probability HP. Brands like Mahillon and Couesnon made these ( in The NL and B there were dozens of makers of these old models! OP ask Mr. de Prins in Antwerp, he is still alive and his family has made and sold tons of these ). They appear regularly for sale in Europe and we’ve spoken often about them because every now and again someone discovers them. If HP they are indeed interesting for Indian Carnatic musicians and I have directed our member Shirish Mallotra to a couple of them. They exist also in the tenor variant of course and way more rarely in baritone or soprano.
This is a similar one (the pictures attaching is at the moment disabled for this thread, don’t understand why).
They are really not worth anything other than being a curiosity, even if branded Couesnon or something with more cachet.
In Belgium, where op has probably found this, they are everywhere because they were owned by some ancestor who played in the local marching band and were kept in the attic until someone discvers them and decides to sell, generally after having found out that the local shop doesn’t want to buy them. If I had a $ for everyone that I have seen I’d been a rich man.
OP keeps on collecting information on saxophones but doesn’t seem to tell us why and in which direction. Collecting is a way to learn about things but it needs a purpose and a sense of direction let alone the fact that he should, by now, be able to tell that the Selmer logo was from a mouthpiece cap.
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