Are you asking a question here? From the stamping, it appears to be one, but from the texture of the body in the photos, I'd be inclined to think that it is not.
However, I don't claim to be the world's authority on the Buffet brand, so take what I say with cum grano salis.
If the question is, "Is this really an R13?" I'm inclined to say that it isn't. R13s do have model designations on some of their horns. However, the stamp isn't on the bell. If you flip through the Buffet catalog, you'll see that the R13 badge is on the upper joint.From the texture I would suggest not. Also, R13's do not have any model designation, only the makers name. Does it have a cut-out in the wood (if indeed it is wood) under the r/h pinky key cluster? I've vever seen an R13 supplied with 2 barrels. The case is not the standard buffet R13 case. Treat this with suspicion.
R13s do have model designations on some of their horns. However, the stamp isn't on the bell. If you flip through the Buffet catalog, you'll see that the R13 badge is on the upper joint.
Hey, I have pictures to back me up. However, it's really a badge and not a stamp, if you want to go with that distinction.Buffet R13 clarinets are wood and don't have a model number on them.