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.

Leopold Uhlmann, Contrabass Valve Ophicleide in D

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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

Henry G. Lehnert, Baritone shoulder horn in B-flat

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black wooden clarinet silver woodwind musical brass instrument

Early 20th Century Brass Lyre Music Stand Lectern

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