as noted above: "Bushing Hammer" - they came in various styles. some look like meat tenderizing hammers. some are odd-looking affairs with multiple "blades" which are replaceable.

see https://archive.org/details/TrowHoldenCatalog11/page/n27/mode/2up - page 26

1925 Dunham Carrigan & Hayden Co. catalog Kraeuter ad pp 227

It appears that they've followed the standard convention in respect to assigning part numbers in 32nds of an inch: e.g., A-1316 = 16/32" or 1/2"

Still trying to figure this one out, any ideas?

If your user name refers to a rusty Studebaker that you yourself own(ed), pictures of that would be lovely, too.

I'll start with pictures of the 1949 2R5 pickup that I drove for some years and then passed on to my son, who built the bed shown (before removing it, because, in California, a utility bed turns a pickup into a commercial truck that has to go through the weigh stations and get inspected for oil leaks, and so on).  It now has an eight foot bed welded up from two original beds.

Note the car phone in the last picture: it's wired into a circuit that believe it's a cell phone and talks to Verizon.

That is one very cool truck!

If you need that, you have no business working on cars!😁