as far as I know, Buffet only made professional-level clarinets back then, i have one from about 1935 , it has no "model number" , only the serial no. & Buffet logos, but i've heard it described as a "pre-R13". Check it's Boehm system or Albert system,and i think all French clarinets from then should be low pitch A=440 Hz, but best check.
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