Cap Clip - Vintage Japanese Fountain Pen

[Pen_Padawan]

Hi FPN,

I have a vintage Japanese fountain pen, the only name is on the cap clip, it says "CAP CLIP". I do not know if this is the name or just a discription, but I will call it Cap Clip since there is no other markings on the pen. I was drawn to this fountain pen because of the filling mechanism, it looks like an ebonite cartridge, I have never seen any other pen with this system. The cartridge is sealed at the end but there is also a big notch cut out towards the end of the cartridge (not sure how this would work). The cartridge is threaded to screw on and off the section.

The nib is steel and reads: IDEAL PEN/ HARDEST/ IRIDIUM/ POINTED/ 3.

 

If anyone knows anything about this pen or filling mechanism please educate me, thank you.

 

Pen_Padawan