A nicely done sequel to a classic pen. This I'm calling the Neopean. The next generation of the classic European. This pen is shaped similarly to the European, but it now takes a Parker refill and it sports a reliable double twist mechanism. Then to finish the remake, I've asked for a rolling clip with some shape to it. No one else carries these kits. It takes an "O" sized bit which you can purchase here. 

Neopean Ballpoint Pen Kit