Agree with two both above.
800 Euro is very good price.
The blade is probably Gendai(modern) for Iai.
Total length 85.9cm which is meaning 60-65cm cutting edge ?
so, maybe it is for female or boy's however, it is good orthodox Sugata, just like Hizen-to. I think it is a good sword.
For western male, this is kind of Ideal for Katate-Uchi(One Hand Cutting) Katana.
The signature is not cut by professional, no treatment of patina, etc,
It is not even try to fake it. so no need to bother signature.
If you don't like Gimei blade, you can pay 200 Euro extra to the JP dealer to take Mei off and make good patina before they send it out of Japan.
You can have a good Mumei sword. maybe it is better than cheap Koto Wakaizashi.