I am looking for a kind of pen

I am looking for a ballpoint pen.
The pen was given from someone
who said he bought it on a street
in Duesseldorf, Germany.

The pen was unusual. At first
when I used it, I thought it strange,
somewhat defective.

As I write with it and pause to give
some pressure on the pen
so as to change the direction
of the pen's course,
the pen would 'collapse' somewhat,
not withstanding the pressure,
as all the other ballpoint pens do.

So I thought it was defective.

But as I tried it, I found
its worth. It is the elasticity
that gives a 'mandatory' pause
and a more assured stability
when making a turn,
just like when you give a pause
and a new direction
during executing a stroke
in Chinese calligraphy,
so that the 'elastic' pen assures
you of a firm grip on the turns.

I came to like it so much
and to belive in its indispensibility
that I dubbed it a 'divine brush'.

Its mechanism is simple. A spring
to be placed near the tip of the pen
for all the other pens is to be placed
behind the top of the ink cartridge
so that, pressed on the surface, the pen collpases
somewhat inward and, released, springs back.

I lost the pen and I like to have another one.
None is available here in Seoul, South Korea.
Is there anyone who can help me
to get another such pen?

Incidentally, pen makers may well adopt the idea.

CK
Seoul, South Korea