What is False Writign Pen on Reality tanto?

[Gator97]

Hi All,

On many online sources Boker tantos have glass breaker (ok,k I understand that) and "false writing pen tip". As far as I understand that is interchangeable with glass breaker?
What is that false pen itself and what is it for?
And is it interchangeable with breaker or no?

Reference link

 

[Samael]

It's a clip that's interchangeable with the glass breaker so you can put the knife in your shirt pocket and it looks like it's a pen.

 

[Gator97]

Thanks Now the pic makes sense too!