A nice alto chalumeau, maker unknown, in three parts, the main body seemingly made from maple, with an ebony mouthpiece.
The chalumeau is the forerunner to the clarinet, having a single reed and a cylindrical bore.
The mouthpiece takes a normal Bb clarinet reed and can be tied on in the traditional way (a modern cloth ligature works well too). It has two brass keys, both of which are wirking well.
Using a number 2 reed, I had to push a little to get it up to A440 so the mouthpiece might benefit from being shortened slightly.
It is playing very nicely and speaks easily. It has a hugely versatile tone that will reward some exploration.
Comes in a purpose built box which doesn’t quite close of its own volition.