|... as the other mouldings..
My father bought one brand new in 1990. I owned an unfaded, bone-stock (paint-wise) 93 vert for the better part of 10 years... what this means is that I have washed stock Z32 bumpers with that strip hundreds of times and I can tell you it is a satin med/dark gray.
I don't believe that exact finish appears anywhere else on the car.
Former Stage V addict... off the wagon.