For Sale: GA audio Glass soundisc

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Up for sale is a GA audio glass soundisc. I'm not sure really how much this is worth so I'd appreciate some guidance. It's 4mm thick and looks in great condition. The centre sticker is missing but come still looks good and sounds great. Looking in the back of the box I found the original typed instructions too.

Ok as I've said I'm not sure on the price so please let me know if it's to high.
Thanks for looking.
£40 posted to UK addresses.

http://i357.photobucket.com/albums/oo14/nuff3rs/b4d07db6a011e8fb1cb13fecb77df613_zpszj8qeorh.jpg
http://i357.photobucket.com/albums/oo14/nuff3rs/0f96b7baf8cf0bd2097febb30fdf009a_zpst230zpus.jpg
http://i357.photobucket.com/albums/oo14/nuff3rs/f87f27989e260b27f3e26525b743fac2_zpsrkfvzqcy.jpg
http://i357.photobucket.com/albums/oo14/nuff3rs/66d13f104bff0b2373a42ba4800178c9_zpsui1ndjpo.jpg

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Ive been advised via PM I'm being a little ambitious with the price. Although over pricing he has said the mat does make a considerable upgrade to stock mats which I would agree plus these are now rarely seen nowadays.

Ok new price £20 delivered to UK addresses.

[mad-moon]

I've got one of these sound discs..and they do indeed make quite a big difference to the sound of your vinyl.....as good as the modern day plastic equivelants..if not better..

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Thanks Alan.

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Now sold.
Thanks.