WASP (W.A. Sheaffer Pen) was a 2nd-tier 1930s sub-brand of Sheaffer though a number of good quality pens in lovely plastics were produced. The lowest of the low for WASP was the Addipoint (add a point. Hmmm...) line. Cheap trim. Often (always?) white metal nibs. Some had a plastic look aimed, I suppose, at Esterbrook (assuming Esties typical marbled injection plastic came first), though the Esties had better (apparantly solid Stainless or similar) trim than the "vaunted" Sheaffer. But, the Addipoints offered some nice colors and have bit of collector cachet from the Sheaffer linkage.
The (some?) of the Addipoints nibs were sold as part of a complete assembly: nib, section, feed, sac(!), all for 25ยข. The bubble encasing the nib might be celluloid. The section is threaded; presumably one simply unscrews the entire old assembly and pops in the new, though I suppose if section sealant were added, this would complicate the process of removal. Esterbrook used a threaded sub-section so one did not need to remove section (and could preserve original sac) when making a nib switch.
Still, a mint-in-tube Addipoint nib is not something seen everyday. Too, most nibs i've seen are fine or medium, this being the only stub I've spotted. I shot a few views of the assembly for my digital archive. Here are couple of the images. In a world with the Parker Aztec, this is low end, but it is not... uninteresting.
David