I personally picked up the $1 chip you describe from the American Casino in Turks & Caicos myself - no doubt. That casino closed and re-opened as your website indicates.

http://www.caribbeanchipguide.com/country2.php?type=MAP

I was in the Dominican Republic earlier this year. At that time, the "big & nicest" casino was the Casino Dominicus.

http://www.casinodominicus.com/

This may be a new casino.