That is, until this little gem surfaced a couple weeks ago:
Note the distinctive ribbed nose and the shape that matches the larger side clip model pictured in The Catalogue. The cap, unfortunately, has a split in it, but as thin as the material on it is, I doubt there are very many out there that don't have a split. This example most closely matches the exampleon the left on page 46, whichis missing its cap entirely.
But most of all, note the imprint:
There's our answer.