I still think it looks like an alpenhorn.

Transcript:

Mr Bugg is blowing into quite a large instrument of the brass family, even though it’s long and rests on a stand on the ground exactly like an alpenhorn, but what do I know. Mrs Bugg stands nearby, hands over what are presumably her ears and a deeply unhappy expression on her face.

The text reads: “Junebugg 24, 1846: The Saxabugg is patented by Adolphe “Bug” Sax.”