Hello all. Yiren Bookworm and jinhao 675 are basically the same pen. Or are they? The Yiren is 4 or 5 times the price of the jinhao. Is there any reason for that? Just seller choice, or is there actually a difference in the martial used to make the pen. I understand Yiren claims to use celluloid. Does jinhao clarion the same? Is that really celluloid? Is jinhao not? Hope to hear from you all. I have a Yiren Bookworm coming my way so want to know where it stands.