There is an auction coming up at Phillips on 5-6 November in Geneva. There is handsome tr-900 that's missing a serial number. I had asked for photos because the last time I saw a tr-900 with no serial numbers it had movement issues. I got the photo and it seem like it a standard as1361 movement and not the tr-900 movement. And it has a standard bp dust cover and not the brass tr-900 cover. Whats interesting is it has exhibition certificate. I thought it should be disclosed because if you look at the three photo on the website you would not suspect anything. Brian