Tube Amp Archive

I recently picked up a cab my brother had given me. It's in rough shape, but he said it was loaded with Celestions. I'm gonna go out on a limb and say that's not what these are. Any ideas what this might be?

[IMG1365]http://i218.photobucket.com/albums/cc165/moto_xxx199/0A1F8FF2-4E0E-4EFD-9B6F-DAEF0E355D34_zpsn6aiv1zv.jpg[/img]

67 = Eminence
7320= 20th week of 1973...end of May, I guess.

Wow! Thanks! I've never dealt with vintage speakers. I wholly assumed they were no-name junk. Shows what I know!