Degussa nibs

[pinesadgj]

I am looking for a Degussa nib for a Columbus 1515 piston filler. I understand that these pens were made by a small firm near Nurnberg before the war. My pen looks like a Pelikan 100 and is about the same size. It has a piston filler which looks like a MontBlanc. I would be grateful for any help finding this nib (and, perhaps, a correct feed).

With thanks.

J. Pines