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Identify horn tweeter?

Nat

Nat

AK Subscriber
Subscriber
Years ago I picked up the drivers from a pair of home brew Bose 901 inspired speakers - a pile (18?) of CTS 5 inch paper midwoofers and horn tweeters. Never been able to identify the tweeters - they appear to be the same tweeter used in the Eastman Martin Gamma 31 and other speakers, and the driver part looks very Foster/Fostex. The only ID on them is the number 596, which, as far as I can tell, is not a manufacturer code.
Construction is black plastic, but the diaphram appears to me metal.
They have, rather professionally installed, what I assume is an inductor in paralle with the inputs.
Any idea?
 

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I'm not convinced it's Foster/Fostex, they usually have a bit rounder rear cover, and usually have some conspicuous identifier.

This one on ebay looks like the same tweeter less the grill, i don;t think it's a Foster/Fostex either: 293510210731
 
The one on ebay does look very similar, and even the number printed on the back of the front plate looks similar. So what is it?
 
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