Salz Peter Pan, missing inner cap or never had one?

[Vach the Stampede]

Hi there,

 

I recently acquired a Salz Peter Pan fountain pen. There is no inner cap. I am trying to figure out whether it is missing its inner cap (...leading me to wonder if I should try to make a replacement), or if it just never had one. 

 

Would appreciate any knowledge from Peter Pan collectors etc!

 

It seems to be a not-as-nice Peter Pan--cheaper celluloid, which makes me think maybe it never had an inner cap? But it's the first Peter Pan I've ever held, so, I'm not a good judge. Photo of the (still very dirty) pen attached.

 

Thank you so much!