What is this Antique Brass Instrument on display at the Musical Instrument Museum in Brussels, Belgium? - Music: Practice & Theory Stack Exchange

Does anyone know what type of instrument this is? It looks like some type of Euphonium, but obviously very different.

Various musical instrument hi-res stock photography and images - Page 5 - Alamy

Musical Instrument Museum, Brussels - Wikipedia

Help me find this new musical instrument, maybe invented in the 70s - Music: Practice & Theory Stack Exchange

File:Stringed instruments - Musical Instrument Museum, Brussels - IMG 3994.JPG - Wikimedia Commons

MIM MIM

Musical Instrument Museum - Brussels, Belgium

Visiting the Musical Instruments Museum in Brussels - Bright Nomad

The MIM To the ends of the earth

brass - Can anyone identify the instrument that James Morrison is playing in this picture? - Music: Practice & Theory Stack Exchange

Musical Instruments Museum - Opening hours, tickets and location

Explore a vast array of Instruments from music cultures from around the world in the Musical Instrument Museum (MIM) in Brussels, Belgium.

Sampling Tea Musicus Society