Well, I've now tried the replacement pen. It definitely appears to be a B italic, or maybe even a B stub. The nib doesn't seem to have any skipping problems -- in fact, just the opposite. I put a fill of Edelstein Topaz in the pen and the nib is HUGE. And really, really wet. Maybe *too* wet.... I'm now getting a lot of feathering and bleedthrough on fair to middling paper. Don't think I'm going to be doing journal entries with this pen. For which I'm considering knocking on doors looking for dry inks.
(The reason I started with that ink? I had been trying to decide between it and Diamine Havusu Turqoise (which had been in the pen I replaced with this new one, while that pen -- the other M200, would be dealing with some of the wacky phone calls I have been getting over the last few years.
Ruth Morrisson aka inkstainedruth