European dagger help needed

[La Gargouille]

Hello!

I have been a silent participant for a while now, and I believe this is my first active participation.

I recently bought this Dagger, of wich I have little information about.
So I come here to ask for your expertise to enlighten me about what you can tell by the images bellow.

The dagger was bought in a french antiquary, and came with a certificate dating it to the late XVII Century. It does not seem to have any sort of markings.

Thanks in advance!

MAC