I have three Visconti roller balls with "Van Gogh" marked on the center ring....two of them (colors Ocean Blue and an unidentified orange/amber) have an arched, flattened clip with "Visconti" on each side. I have a receipt for the Ocean Blue; it is a "Midi" purchased in 2004 for $96.00. No receipt for the orange/amber pen. The receipt for the third pen is shown as "White" but the pen looks more like the "Vanilla" color I find on the internet -- streaky white and tan. It was purchased in 2003 for $135. It has a different clip -- it is much slimmer and has "Visconti" only once on the topside of the clip. Can anyone provide me on any information regarding these pens, specifically why all three are marked "Van Gogh" but one has a very different clip, and why one pen was so much more expensive?