I just bought a Canada 12 Pocket Self Filler in very good original condition.
When I opened the pen, I was surprised to see a transparent sac, and I wondered if this could be original.
If it is, I will leave it in place as it seems to be pliable and doesn't leak. If it's a replacement (which I suspect) I will replace it before use/sale.
So, does anyone know if this sac is original type?
Incidentally, the nib is astonishingly flexible!