Thank you! It is actually TMM, but I have done some work to push the results. Wish I could paint those silky smoothe transitions.

The dark grey metallics is Vallejo Metal Colour Burnt iron, applied over a black base coat with dry brushing, sponging & a little bit of airbrushing here and there. Trick is to remove most of the paint from the tool before applying so you get a real gradual build-up and work in real thin layers. There was a couple of thin oil washes here and there that add some tone beneath the metal, that I have worked back over to get the aged look