Thank you DAHenkel for this first reply. I must admit I liked this kris very much, but I didn't suppose it could be so good in your opinion. So now I'm waiting for others much more impatiently.
About "oversheath" - yes, you can be right about wrong orientation of this, take a look at third picture from the end, you can see the upper part doesn't fit perfectly to the sheath
And a "poor collection" - that does mean there are not many krises in National Musuem..., it doesn't mean they're not good