Hi Jim:

That is actually just the center "coin" inlay to the Frontier $100 chip. Quite a bit were found a few years back when one of the strip hotels was demolished. They were buried in concrete, I can't remember where or when it was specifically.

Here's a link to the ChipGuide page that shows the actual chip the inlay came from.
http://www.themogh.org/cg_chip2.php?id=NVLVFO

Here is a image of the chip from the ChipGuide as well.

Todd Barrett
#5068-91
Ramona, CA