The latest incarnation of the Tikky mechanical pencil is significantly different from its immediate predecessor, so I’ll point out a few of the main changes below.
I have two older Rotring Tikky’s dating from the early to mid 2000’s. The white 0.9mm is logoed as a Rotring Tikky II (1.0mm) and the brown 0.5mm as a Rotring T. Apart from the name, there’s no obvious difference between them upon visual inspection. They are pictured below with the current Tikky.
Completely different pocket clips.