Hmm, just now looked at the other pics; didn't know they had a rectangular theater version, only the corner horn one and even then only seen a chainsawed one, though definitely early as it has the 808 HF horn inserts to extend it.
Since the 821A is the finished corner cab only, it seems reasonable for the rectangular one to be an 822, though never aware of it. Scroll down for the early 820 doc: Altec
As for Altec actually marketing this I can't imagine why since the basic horn was introduced circa '49 as the 800 Vott: 800 VOTT
Then in the mid '50s it was updated a bit with a tapered horn as the A7 for the introduction of the new 811 sectoral horn [1954]: Altec
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