Let me start this by saying I am by no means a great writer with a flex nib...
The pen used here is a Parker Vacumatic with a factory Flex nib that was tuned by Richard Binder...
He did not make it flexy, he just tuned it for smoothness and wetness...
It is a beautiful nib that I am still learning to use correctly...
The new FPN Tulipe Noire is a fantastic ink for this nib showing a nice bit of tonality when I do my part, which is not too often
So here is a scan of the writing sample on a Clairefontaine pad...
Click to view attachment