Please take a look at the following video see if you can figure out what fountain pen this person is using. It's an interesting little video about some obscure "origami" and I found it doubly so because she is using a fountain pen.
The fountain pen part starts at about 3:34 into the movie. I don't know what the pen is but I might guess the nib would give a good hint.
http://www.wimp.com/morehexaflexagons/
Cheers,
Rich
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