A while back I bought a pen labeled as a Kultur Phileas (sort of iridescent copper-colored injection molded plastic). Since then, I have seen much more expensive pens labeled as Phileas. I have also seen pens just advertised as Kultur.

What's the story? Are they distinct pen lines? Or was there a lot of price variation in the lines? Was Kultur a subline of pearlized Phileas shaped pens?