I have two other pens that are very distinctive as well. I forgot one once and kindly asked a colleague to threaten anyone who looks at it.

The top spins, its heavy, the thing you push to get the pen is super fidgety.

And the last one is wooden with a cool emerald looking bulb at the top surrounded by golden looking boundary.

If anyone steals my pens, I will know. And I will shove a Foley up their nose