They would appear to be the 'Urei 800H Custom H.F. Horn'
Search on my post RE: 'Urei Custom Horn Mod' :
http://www.hostboard.com/forums/alte...highlight=urei
Therein you should find a link to the Urei doc w/pics of it.
Interesting that they also came out of a studio, like mine purportedly.
Though mine came out of 'big red' monitors. Not actual big red cabinets afaict, but perhaps some built to similar spec., or Big Reds then later modified.
I should try to figure the dates on mine.
* Update/clarification: Mine are Altec 604e's, with the 800H horn affixed to them (perhaps by Urei or we'd suspect the studio engineer themselves). Now, worth mentioning, mine do have markings on each which might reflect that someone had done some 604e matching at some point (appeared to be Fs notations IIRC).
Will have to record and decode when I next pull them out.
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