Found this dress in a facebook German site about Empress Sissi (if I'm not wrong a few photos of this or a similar dress were posted time ago, only that the gown wasn't completely photographed). According to the site, the dress was going to be auctioned a year ago (October 18th, 2012), the start prize was € 7,500... I wonder what prize it finally reached. Anyways, it is much cheaper than the Czech blue velvet dress mentioned on the previous posts!