Might be worth an email...
I think those have ports top and bottom, probably pre-EAW Forsythe stuff...likely JBL loaded.
Most likely 2 inch Alnico JBL drivers on big aluminum horns...I think I see 421 and newer Altec boxes have the "hole" dust cap....likely 515G?
a set of Frazier...
not 16 pieces in the photos...so dunno what else....
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