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Thanks to you all for your super help and good advice! 

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I´ve got a receipt today, and it was bought march 2009. 

But I´m curious about the missing part of the dome. The seller says everything is in good shape, and nothing about missing parts. 

https://www.studioveena.com/photos/view_photo/5027ad4b-7618-444b-b5ad-285e0ac37250

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X Pole Tech – thank you for your comments. So how should the upper dome look like with the unit that seems to be missing on the picture? And how old har the old x-pole´s? What´s the differents between the old and the new styles?

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Try now: https://www.studioveena.com/photos/view_album/50257005-5ff0-4ae6-9d60-74f30ac37250

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I can see the X on the bottom dome. It´s hard to see if the dome´s rubber is clear or black around  because it´s in the bag, but I have asked about a pic of the upper dome to see the serialnumber –  as you suggested Sensualscimitar.Thank you for your link, found a bigger pic at googel. I have also asked for a pic of the receipt.