Mess up Recipe:
240 grain sandpaper for the edges
400 grain for the case back and some
1500 wet for the crystal and rest of the case.
Then I stirred it around in a bucket of screws, bolts and nuts
for a good 10 minutes before spraying matte black stove enamel
on it and finishing with a dremel polish.
That's about it.
I removed the bezel ring - leaving the insert in place and dumped it
into a cup of urine - no wait - chlorine for app 10 minutes. Rinsed
it in water and put it back on.
Be sure to do this in baby steps - If you leave it in the chorine too
long it will look like this: