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It looks like a portable amplified lectern. There's a speaker behind the mesh on the front. If you undo the latches on the side, it will open up and it has a gooseneck mic that attaches to it.Edit: Very similar to the thing in the photo.
It doesn't look big enough to be a lecturn with built-in PA amp and speaker. From your photos it looks like a "powered monitor" from the 1960s era when that was a rather rare thing.A close-up photo of that panel on the back would be very likely to provide a more definitive answer.
Looks like you called it. Here's an ebay listing of one with good pictures.https://www.ebay.com/itm/254111757377