On right is a Parker Vector fine italic nib I've used since the '80s. 35+ years of wear, mostly during school years. Left is new.
The tip on the older one is much more sharp edged and slightly wider, the new one is more like a stub with round edges. You can see the difference in how it writes.
The section "collar" under the nib is what the cap snaps over and holds onto. It is is worn significantly, contributing to a poor seal & loose cap.


I thought maybe the design changed, but I rarely used the medium italic nib from the old set, and the new MI is the same width and both have slightly rounded stub-like edges. The older one is also longer.
Even with the wear, the old FI is still narrower than the MI, and I actually prefer the sharper edges.
The down side is that even a new Vector doesn't seal all that well, so the older one is even worse.
The poor sealing is what primarily motivated me to try new/different pens.

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