There has been one on eBay recently in Sydney with what looked to be a washed out backglass that didn't sell for $1500. Then went to $1200. Dunno if it sold.
I had a look at that machine and it was in pretty good condition - much better than the ebay pictures depicted. Had been owned by a family for years they claimed and seemed believable to me. BG was sound, no flakes or scratches but really washed out and faded, pc boards were very clean and un hacked. PF was pretty good as was cabinet. I offered them $750 which they would not accept - the low offer was more because I didn't really like the game play and thought it would have been a good buy at that price.