How is this 21 different than a 51 Special?
I picked this up over the weekeend. Most Parker 21's I have seen use a plastic that is warped and different than a 51. This one seems the same as a 51, and the nib hole is the same as a 51, the ring on the hood that holds the cap is the same as a 51.
What is this pen? The cap says it's a 21.