Don, there is a seller on ebay from Peru who sells these rather regularly. Also, a quick search on google will reveal an El Condado Hotel in Lima Peru. (note the same text on the hotel frontage as on the chip - El Condado) http://www.condado.com.pe/pages/index.php

I'm not sure if this is the exact El Condado Hotel the Casino Diamond operated in, if it still does or if it did & is now closed. I assume closed as I see the $100 Casino Diamond chips on offer every now & again going cheaply. There's also a $1, $5 & $25 to the set I know of.