I am restoring a couple of Conway Stewart 388's. Pen One is in original condition and I don't have the need to knock out the nib so cannot identify it size number. Pen Two 388 does not have a nib. Checking with the Jonathan Donahaye site it states the nib is a CS5N.
I have a spare CS5 nib that looks to be the same length as Pen One's nib but a lot broader and would be too wide for the feed. I am thinking the N perhaps stands for 'narrow' which would explain the difference?
If anyone could clarify this for me would be most helpful.