Key identification - stiletto key?

[Vladimir]

I've not seen one like this, but a similar decorative idea with a corkscrew is common. A few other objects have been made up to resemble a key, such as a thermometer.

It is a very elaborate key. A lot of work.
Soldering, thread work, drilling. A lot of file work.
Nobody will put corkscrew in it.
it's like using microscope for hammering nails.

And nobody will make such amount of work to put this pointy thing inside without good reason.
And it is obvious - it pointy thing not a weapon.
In time when this key was made - corkscrew was corkscrew and thermometer most possibly wasn't invented yet.

Most possibly this key was made in XVI-XVII sentury.
Corkscrew in key is a nowaday thing.

Jast my opinion. Maybe I am wrong.
Respectfully.

P.S. If you will post picture with higher resolution I will be very grateful.
I am collecting pictures of keys like this one.