I bought this door a few years ago from Pinball Life. I never installed it.
It is a Stern coin door with the wiring harness installed and the harness is for a 3 button service assembly (I think these types of doors are for the Stern Whitestar boards and not the SAM boards that had 4 buttons). I believe this is the part number - 500-5018-172.
It is fully populated, including the wiring harness, service button assembly, coin mechanisms and lock/key.