The Principal nib made by Leonardt is a copy of the famous Principality nib, which is appreciated for its exquisite behavior as a very flexible pointed dip nib. Original Principality nibs are now found on auction sites like eBay for close to US$100. There are other nibs thart try to copy the Principality nib, including the Hunt 101 Imperial nib, but the Leonardt Principal nib seems to be the favorite. A group of calligraphers approached Leonardt with their request for a more authentic rendering and helped Leonardt develop this nib, which is very popular.
We provide these pens that contain Leonardt Principal nibs: