The stashbox pen looks just like a regular pen and has a working nib to write.
The Stashbox Pen contains a hidden stash vial inside the body of the pen. To access the stash vial, twist the piece above the connecting ring.
It seems unlikely, but in case someone is doubting the realness of the pen, simply twist the conical end of the pen to reveal the nib and leave him baffled with your autograph.