Please help me identify this clarinet!

[Jpt0507]

I acquired an old clarinet about 4 months ago and I have searched every since to find out what kind it is. The serial number is "B 3520" and it says "Made in France" and that's it. No other marks or stamps are anywhere on the horn. Not even a wore off unreadable stamp. NOTHING. If anyone has any idea of who made this clarinet please let me know. Being a clarinetist, now more as a hobby, for 20 years I have never came across a clarinet that plays more beautifully. the top joint has a metal lining, the bottom joint does not have this, but is a wider bore than most clarinets I've seen, as does the barrel. And all the numbers match. I am stumped. PLEASE HELP! I have posted this on another website and a couple of people thought it might be a malerne, I was hoping for some more insight into this!