This was manufactured approximately 1977. Do not confuse this with the tweeter for the AR-11 or AR-10PI, it is not the same. Removed from a working AR-12 speaker. Fully tested with test equipment and a music source. We have added a new felt dispersion ring. We seldom have one of these as it is unique to the AR-12. You might want to consider one for a long term spare. Suitable drivers for the early model AR speakers are becoming harder to find. If your foam seal has deteriorated, new foam gaskets are available in Dept. OTHER SPEAKER SERVICE PARTS. AR speakers require sealed cabinets to achieve those low bass notes they are famous for. We usually have over 200 AR items listed. If you would like to be advised of new and exceptional items as well as our sales, please sign up for our Newsletter. The free listing tool. The item “ACOUSTIC RESEARCH ORIGINAL AR-12 TWEETER CORRECT FOR ONLY AR-12″ is in sale since Wednesday, November 18, 2015. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “vintage-ar” and is located in Albany, New York. This item can be shipped worldwide.