I have an extra of this oversize brass-core sample from Reliable. It's 41 mm in diameter, the size they used for promotional chips.

This one is different from most of the manufacturer samples in that it has flat blank centers. Both sides are the same. I believe this is the kind of chip that Mel had engraved as souvenirs for the dealers at one of the chip shows.

Other side shows a little tarnish on a couple of the brass areas but could be polished as it's only on the surface.

First $25 gets it, postpaid.