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.

Musical Instruments Museum (MIM) - All You Need to Know BEFORE You Go (2024)

The Musical Instrument Museum – Brussels, Belgium - Atlas Obscura

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Musical Instrument Museum, Brussels - Wikipedia

Musical Instruments Museum - Opening hours, tickets and location

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

The Brussels Musical Instrument Museum has some of the rarest instruments from around the world in its collection

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

Musical Instrument Museum - Brussels, Belgium

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✓ MIM-Musical Instrument Museum - Data, Photos & Plans - WikiArquitectura

The Brussels Musical Instrument Museum has some of the rarest instruments from around the world in its collection

✓ MIM-Musical Instrument Museum - Data, Photos & Plans - WikiArquitectura

Musical Instrument Museum - Brussels, Belgium