Vitavox was OEM for JBL thru DuKane. I am 90% sure those are 3 bolt 1 inch JBL.
Decent horns.
FWIW early Altec one inchers are 3 bolt too. When Altec switched to two piece horns they changed. After Lansing left he continued with the original pattern.
As far as the seller not having seen them in "40 years of trading". kinda makes me think the seller is pretty ignorant about stuff. I've seen dozens, they are not "rare" at all.
A little knowledge being dangerous and all that...I wouldn't comment except the seller seems to use the fact they haven't seen them as a selling point. To me it reflects negatively on the seller.
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