Unknown pepper pot drivers

Hello
I've found two old drivers and horns in a music store.
The drivers have Imperial screws and 1,4" exit, so I suppose they are US made. The horns are not CDs, and the magnets are big Alnico, so they have been probably made in the late Seventies. The most original part are the "pepper pot" phase plug.
The plastic binding posts seem not original.
Only one driver had a broken Altec diaph installed.
Can someone help to identify these?
I enclose some phots.
Thanks for your attention and bst regards,
Pere Ubu