A suffciently common pen that I'm not setting out to write a review of the pen. However I got this pen with a custom nib with added Flex from Pendleton's Pens. The original nib was supposed to start with an F, and then add Flex. It ended up as a fine italic left oblique with flex. Which I have to say is a bit of a mouthful. The oblique is a left oblique of 5-10º. The italic with no flex is XF vs F. And the flex gets out to B or BB.

The nib is a lot of fun to play with. I want to primarily just refer you to the pictures.