What have we got here?

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http://cgi.ebay.com/ws/eBayISAPI.dll...category=14993

Definitely an Altec diaphragm (see EIA code) but is it an Altec driver?

[mbenterprizes]

Looks like a 291 series, I have a pair that looks like them, but no "Rain Drain" pipe. these were mainly used by the military...

[Roland N R]

Looks like Phenolic diaphragm 290 d-e series large format= "giant voice". If so being used as tweet gives limited benefit since basically just a band limited MR driver.

[mbenterprizes]

Roland;
I had a typo in my post, I said 291 I ment 290D, yes they are not good for tweeters, but man what a voice...