In a current Gunbroker auction for some “Diablo” brand 9mm, they show DKC 9X19 and PCM 9mm LUGER brass. I find that DKC is a known entity at the link below, but I don’t find much of anything on PCM.
Odd 9x19mm headstamp - General Ammunition Discussion
Blog - DKC Brass & Bullets
VR-Zone Tech News for the Geeks Mar 2011 Issue by VR Media Pte
Magazine - Car Mechanics - 03.2018, PDF
Defence Industries 9mm drill round - General Ammunition Discussion
9mm Round - General Ammunition Discussion - International
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Blog - DKC Brass & Bullets
9mm parabellum (new to me) - General Ammunition Discussion
9mm Brass Case Samples & FMJ Bullet Samples - DKC Brass & Bullets
Unknown 9mm Parabellum - General Ammunition Discussion