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A hole was added to the cap in 1991.
Was that to try and prevent choking?
Yes. From the BIC website:
Why is there a hole in the cap of BIC® Cristal® Pens?
Our vented caps comply with international safety standards ISO11540. These standards attempt to minimize the risk to children from accidental inhalation of pen caps. Traditionally the pen cap served only to protect the pen point. These vented caps allow more air to circulate around the pen point when the pen is capped. This further adds to the quality and overall performance of the pen.
Wait, the hole in the cap is that recent?
Dude... That's 34 years ago.
How dare you. I wont be 34 for 7 more months...
Yeah, I know I'm approaching fossil age, but the pen itself was first made 75 years ago. I had always assumed that the hole in the cap was a change made much closer to the 50s than sometime within my lifetime.
A very helpful comment
According to the Wikipedia article.