Does anyone know what this horn was used for? Is it made to be mounted standing vertical so the sound goes out all around?
It appears to be the center portion of an old typical large reentrant (folded) PA (public address) horn.
The outer horn bell is missing, as is the thread on driver.
I used to own a bunch of "MASH" (mobile army surgical hospital) horns that had detachable horn bells (around 24" across) that could be stacked like Dixie cups. The bells clipped on with overcenter clamps.
Could fit 16 bells and center portions in a large car trunk, more than enough PA coverage for an 18,000 seat grandstand.
I paid around $25 apiece for them, the price asked in the ad for just a portion of a loudspeaker would only be worth it if someone found the piece to be aesthetically appealing.