A customer brought in a handfinished frame for re-glazing. The handfinishing was just stunning. It was produced to order about 10 years ago by a framer from London. I've included a couple of photos below in the hope that someone can tell me how this wonderful finish was produced:

The finished result is a metallic pewter finish with various apparently randon little dark lines (which look like cracks in the paint, but are not), scratches, dents (done before applying the finish) and scrape marks. None of these effects look in any way contrived.

I would be grateful for any tips how such a finish may have been accomplished (especially the distressing effects) and how one can obtain the pewter paint finish - I assume that this was mixed using some other metallic colour of paint, since I am not aware of a siutable ready mixed paint off the shelf.
Thanks,
Mark