The “Covert”  was a standard R9 bought in bulk by a Texas dealer, sent to Wilson Combat for tuning and it’s black coating, then marketed.  I owned one, which for some reason gave me loads of trouble until it finally ate the slide retainer pin and destroyed a rail.  It had “COVERT” prominently on the slide.  I believe this is simply an R9 Stealth.  I have one of those also, No. 47xx, my favorite EDC.