Thanks, someone else on this board had called it the "Primer Punch Bushing Screwdriver" and I found that as #51. The drawing in the picture from the original manual is much different. Luckily, the estate from which I got these had kept all the original documentation and receipts, so I was able to match everything else up (including the extra 6 decapping pins the person bought and never used). I was there for 45 ACP brass when they told me to take these too (Luber/sizer and the press in 45ACP). Based on the documentation, this was bought in 1968 with some very minor usage and then packed away for 50 years.