Thanks to contributions from fellow enthusiasts I have been able to expand the range a bit. I've also done some digging in my boxes of parts for more examples. The new additions include two Hiduminium Spearpoint stems drilled and tapped for a centerpull brake adjuster screw and two examples of steel Spearpoint stems (one each in Kromo and 531 tubing).
Be sure to check page 2 for the steel stems.
All photo contributions are welcome, as is any information about the stems pictured. Please feel free to add comments to the photos directly in the gallery. I've posed a few questions in the descriptions.
Portola Valley, CA USA