I do not have extensive experience with dip pens, so other Members will have much to add.
Many dip pens are not at their best when paired with FP inks.
Some nibs / pens are vintage or discontinued, plus a thriving population of current production.
-> Not to plump a Vendor, but to give an idea :
=> http://shop.kallipos...e/bandzugfedern (Makes me dizzy
I have settled on the Brause Ornament series. They have dual over-under reservoirs, so I can use FP inks and write a fair bit until I need to recharge them. The nibs I use are in the FP range of widths, which are smooth ball-shaped mono-lines. (I have enough trouble running a 1.1mm Stub at pace, and am not the least shadow of a whisper of a calligrapher)
They are sufficiently consistent that I can read across to what a 'normal' FP would deliver, so I use them for ad hoc ink sampling, and for the times that I choose a non-FP ink for a bit of jotting.
For square-tip I prefer the Tachikawa series.
Member dcwaites has what might be a better solution, but I've not had the time to give it a fair go: http://www.fountainp...-nib/?p=2690628
Brause Samples, from Gal-Lexi recipe :
Edited by Sandy1, 18 August 2017 - 01:05.