I’ve been looking to acquire a Pilot fountain pen with a Waverly nib. I see that, on eBay and other sites at least, that I can get a 742 or a 743 with a WA nib, but to get a 823 WA I would have to purchase from Tokyo Pen Shop Quill. Does this mean that the WA nibs for 742/743 come directly from Pilot? In other words, not a modification by a third party. And why does the 823 not have WA as a direct-from-manufacturer option when it’s the same #15 nib (and I believe the same shape and dimensions) as the 743?