What is this Antique Brass Instrument on display at the Musical

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

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Made In London ( United Kingdom / England ). 70- 80 Years Old Antique. In Good Original Condition. ( As Per Age ). Has Boosey & Co. Trade Mark With

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Its a Musical trumpet and its iproduce loud sound.

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It is easy to carry, can be used at any time, and is also very convenient to store. When traveling, you can play any music you want on the way.

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

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