@Chris: I bought the pen at the "horn of plenty" store.
As to the video, I would consider this an exercise in lettering. It, the calligraphy, is amended, "touched up," with the same pen.
I wish I would have had this video when I submitted the design to Dave and his crew at FontBureau. One of his techies saw the l/c 'a' and said it cannot be done with a pen. Needless to say I had a giggle at that. She was a "type folk" David!