I realized today that I had several different headstamps for this caliber and wanted to show them. I believe the most recent headstamp in this caliber was from Jamison, and is a JBA headstamp, dating from at least a couple years ago and for a few years running before that. Other than what I show below I know there is a R-P, and a U.S.C. CO. headstamp, as well as all of the various ART dated heasdtamps that went to France. What else is out there, and what is the one I have with only the lower half headstamp?
The bottom row below shows headstamp images I found online: