Don't know about the converter but there appears to be nothing wrong with the cartridge. Why not clean the pen, fill the cartridge, and give it a go?
I'm planning to use that for now but cartridges wear out pretty fast, will feel much better if I have at least replacements at hand
Have you tried a standard international cartridge? Sometimes different formats may fit. Some people use Lamy converters in Parker pens.
- International long and short
No luck so far
The shape of the barrel also makes me think it might work as an eyedropper, too.
Good luck finding a proper converter! Maybe the region-specific forum would be more help?
All else fails, that might be the way I'll go. Thanks for the suggestion on the region-specific forum
I have a modern Platignum. It doesn't take a standard international cartridge. The narrow neck section of the Platignum cartridges (which look identical to the old one you have) is longer than the standard international size. Cult pens sell a Platignum converter on their website (£3.60) and also the Platignum brand cartridges. I was told that Manuscript converters (50P) also fit Platignums. That seems to be the case though I haven't tried to ink my pen yet using such a converter.
Modern Platignum converters don't look like the cartridge I have, and I did try a Manuscript
Would the sailor converter fit?
I can't get a scale from the picture but it looks similar.
I'm ashamed to say I don't have a Sailor pen (yet), might ask my friends to let me try one, thanks for the suggestion!