gloss black dulled down maybe 15-20 % ----- kind of a cross between gloss black and satin black.
basically you just want to take the glass like shine off of them.

Duplicolor gloss back engine enamel is fairly close if you going to use rattle cans( not advisable)

I had a K frame powder coated and I think it came back to glossy/shiny. But the customer likes it so it stays as is.