The following info comes from the man that has been making them for 25 years.

The coin inlays are stamped from .050 and .053 inch thick Stainless Steel strips about 1 and 1/16 inch wide.

The older ones with the Concentric Circles were put in a press and polished with a wool buffer. This was done one chip at a time, by hand.

They no longer use this process. He was not sure what year the changeover was made.

The newer process: They put the inlays in a vibrating bowl with what they call “media” pellets (stainless stele pellets) and a strong liquid soap & water. The bowl polishes them.

GPI says they will now only make reorders of the coin inlays. No new orders.

I did get them to agree to make some Playboy LE's for the Palms but the cost for the customized rims is so high, I doubt it will get done.