Hi Wouter,
Since the title of your thread is "Purchase advice needed" let me give you some. Before you spend a penny on a sword, you need to learn a whole lot more about Nihonto than you now do. The fact that you weren't sure about the train wreck of a fake above tells us that you are exactly where each of us was back when we started. If you spend time and money on study (here at NMB, at sword shows, with good books, other sites online, visiting collections, etc.) you will be much better prepared to buy something you'll be proud to own.
You wouldn't expect to walk into a flea market as a rube and come away with an old master oil painting; works the same with Japanese swords. Buy books first; swords later.
Grey