Don't you think the background is a little uncommonly undignified for an imperial photo? I've never seen a royal in those days photographed in front of such an industrial outbuilding, not even in photos from their private albums, only from photos taken in exile or captivity. (Though it could very well be from a courtyard at a home farm or an agricultural estate.) If it was an imperial photo, it sure wasn't intended for publication, but comes from a private album, and then it ending up on e-Bay is even less likely.
I'm no expert, will be interesting to hear if experts think that this odd-looking photo could be imperial.