I have a pair of System 600s that I've been using in my computer/desktop setup. I've more or less moved to a headphone rig for this, and so need to sell the Tannoys. These use a 6.5" dual-concentric driver and so aren't really related to the famous/classic big Tannoys, but still are a good speaker. They work very well nearfield due to the coaxial arrangement, although the best I've ever had them sounding was on stands using a Jolida SJ202 - having to decommission that system when we moved still stands as a big-time audio regret.
I'll try to get some photos of the actual units up if/when I can find our camera. They are in very good condition with only a single tiny blemish on one of the front baffles. This is the first link I found with an OK picture for reference, with a bonus that it provides price comparison (although I didn't think they were still available new)
http://www.coastrecording.com/store/catalog/product_info.php?products_id=157Asking $275