I bought a box of Panther ammunition and headstamp was STR, which is already in the guide.  However, this version has capitol "M"s after the 9x19, and dashes before and after the date.

This was the same for 49 of the 50 cartridges in my box.  One lone cartridge had a DKC headstamp and extractor mark.  (???)  (tell me you loaded one in the chamber with no mag without telling me. ;)  )