This is a well known effect. The methods, while similar, differ in numerous ways. We do not know the manufacturer of this particular apparatus. What we do know is that it is extremely well make, and works very well.
There are no instructions for this effect; but this should not be a negative for those who understand the principle and are willing to devote the practice to perfect the effect.
The pen is very well made, and looks extremely good. It is in a pristine mint condition. Just look at the photos. We think this is a very good value for many magicians getting started in coin bending.