The "Pick Pen"

[RobHarding]

Hi I am very new here, and new to pen restoration, for that reason please excuse my ignorance on the topic. I recently acquired a beautiful "Pick Pen". Everything seems great apart from the fact that the top of the cap is missing a jewel section or fennel and so the interior of the cap is open to the air when closed. Also, a part of the inside sleeve that protects the nib came loose inside the cap. What's interesting is that upon removal I noticed that the material seems to be a charcoal sleeve.  It had broken up, but when placed together it makes a perfect half circle, I assume this is how it was originally inserted into the cap. Does anyone have any idea what the missing piece on the top of the cap looks like? The end of the barrel has a celluloid plug, it doesn't seem to follow the taper of the barrel and the surface is uneven and not particularly beautiful. My guess is that a similar plug was glued in the top of the cap. From my research and observation the nib seems to have a great degree of flex. 

 

Any input or advice would be helpful. Thanks

 

Rob