Help Please

I have a wooden Evette & Schaeffer clarinet by Buffet. The SN is K20530 and there is an "11" engraved on one of the bottom keypads. The emblem, that is found on every piece reads: Evette & Schaeffer; Paris; France; Modele Buffet Crampon. I have an original box that is rectangular, curved edges with the blue felt on the inside. I'm assuming there is some silver in the keys because there is green build-up.

Basically, what information is available on this clarinet?

Thank you in advance!
 
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