It is a replica of a Berliner tuba from 1850. The original is a Julius Lemcke from Berlin. Like the original, the replica has a 15mm Berliner pumpen valves and an (almost) cylindrical leadpipe.
I played the Bombardon aria from the opera: Das Goldenes Kreuz by Ignaz Brüll. At the piano the fantastic Natalia Nazarenus.
Have fun listening
https://youtu.be/mv3S28JfAY0