The Guy Renne clarinet I have is a good example of a Couesnon clarinet. I have liked all of the Couesnon stencil hard rubber clarinets. However, this one has too many screws that refuse to budge, plus one broken key. I have elected to just keep it for odd parts.

Barrel: 63mm
Bore LH joint top: 14.85mm
Bore RH joint bottom: 14.85mm   This is a little wider than some of their wooden instruments, and not as wide as the Jean Cartier, which could also be by Couesnon.

Clear signs of Couesnon being the maker are:

• Single post for the left pinkie keys, which are pin-in-hole design.
• An indent under the right pinkie keys.
• Straight shape for the bridge key on both parts.
• The LH C#/G# tone hole has no bevelling like all the other tone holes that are closed with a pad.
• The throat tone A and G# keys are held with three posts, instead of four.
• There is no adjustment screw on the top of the G# throat tone key.