Rotring Trio Variants

There was a time when I was looking for my first vintage trio. I thought that having one would be enough. However, this idea falls when we know more about these items, we read more about them, getting the minor differences between each one. This is the time when hard questions arise. “Shall I sell or trade this pen? But this is different from the others...Shall I start collecting this brand? Ok, I will keep only this model! “. This is the time when we begin to be collectors.