I bought this from Andy's Pens.
I liked the idea of an eyedropper as those fillers have to be disassembled for repair.
Due to its age I hoped to find some more obscure elements, and was not disappointed.
In case you can't read what is written on the screenshot, it says the following:
I can't remember the reason for the negative figure with gold
So this is where I stop, there is Iridium in this nib, but mostly there is no iridium it is just a generic term.
However, iridium has an interesting aspect, it is present in significant quantities in the KT layer