They are circa 1961/2 and were first announced in 1959 although with 2 tweeters that I understand were GEC units used in the prototype. The mid/hi was developed with GEC using the 2090 as the basis which is basically an Alted 288C. The diaphrapms are the original Westrex ones which I thing are pretty much the same as the Altec ones.

I think GEC pioneered using a compression driver as a dome tweeter with their "presence units".

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