Thanks to everyone who has responded :).
Although further research doesn't make much sense, it would still be nice to know if this is, a newer but still a Japanese made sword, that would have been faked to look old.
I bought this sword from Japan, from a Japanese auctioneer, which makes you think that there is a pretty low probability that they would sell, for example, a Chinese sword with a fake torokusho.
Wouldn't that be a pretty big crime on their part ? But I'm just guessing here, and of course i can't rule out that possibility.
However, let this sword be a lesson to myself to research things more before buying anything (luckily this sword wasn't very expensive).