You guys really know your pens!!

It is indeed the "Citroenpers" Pelikan M200, modified. The original steel nib has been replaced with a 14K M400 nib (although I'm not 100% sure about that) and it's original black clipring has been replaced with a gold-plated one.
I recently bought what are supposed to become two of these modified versions (one for red ink and one for blue / blue-black / black ink).
http://www.vulpennen.nl/merken/Pelikan/M25...troen_alles.htmThis penshop, P.W. Akkerman in The Hague (which should be known by anyone who ever visited The Hague and likes FP's, no relation), modifies the original "Citroenpers" pens to what you can see in the picture posted above. They deserve all the credit for the idea and the pictures etc. etc. I'll probably have my two "originals" modified there.
Best regards!