@luckygrandson: don't think it's a Crusader. According to the Taperite profile on Binder's site the Crusader was simply a lower-priced Taperite, keeping the design and the 14K nib.
But Richard's profile includes a photo of a pen with section threads, similar to mine. But this was made in Canada.
I wonder if the pen I have somehow had its nib pushed in too far? Online searches turn up no Waterman hooded nibs that look like that. Gotta knock it out some time and take a look...
@Ernst Bitterman: thanks for the advice

Wow, how broadly applied was the "Skywriter" name? Thought Skywriters only came with open nibs and the torpedo-shaped cap.
I bought one from another FPN member once, that was similar to the pens in Jim's article -
http://www.penhero.com/PenGallery/Waterman...writer1950s.htm- but had a gold-like chromed cap with no ridges. Nice pen, smooth nib but using it was like writing with a nail.
The mystery deepens!