Originally Posted by Gus

The other sharpener nosecones are shown in the photos below. They were sold by the Sterling Plastics company of Union N.J. They used the same Leeds Sweete patent as the earlier sharpeners and may have acutally been manufactured by Leeds Sweete.

Photos below show the Sterling sharpeners in their most common package, then some comparison views of the Sterling and Leeds Sweete sharpeners.

Of note, for anyone who buys one of the sharpeners, the originals used a turned wooden plug as the nosecone shoulder. But today you can download one of the 3D files (Thingiverse?) to print a plastic shoulder.

And, again, really nice thread about these sharpeners is here.