It's a Swartz Safety which is a pseudo 80 series type that moves the firing pin safety with the grip safety instead of levers that bear against the trigger group and is a much improved trigger pull.

neither it is a Kimber series II safety (Swartz Safety) see article sightm1911.com/lib/tech/Kimber_SII_FPB.htm

Hi Robert, Kimber (Series II) pistols use a Swartz Safety. Kimbers are neither a Series 70 nor a Series 80. The Swartz safety are parts that don't exist on either a S70 or S80. From the factory, Kimber uses a Series 70 extractor, a Series 70 grip safety, a Series 80 firing pin stop plate, and a proprietary firing pin (esp. for the Swartz.)

Robert, Kimber (Series II) pistols use a Swartz Safety. Kimbers are neither a Series 70 nor a Series 80. The Swartz safety are parts that don't exist on either a S70 or S80. From the factory, Kimber uses a Series 70 extractor, a Series 70 grip safety, a Series 80 firing pin stop plate, and a proprietary firing pin (esp. for the Swartz.)

neither it is a Kimber series II safety see article sightm1911.com/lib/tech/Kimber_SII_FPB.htm