Early 1800's THAILAND /SIAM PORCELAIN GAMBLING TOKEN-Excellent -25mm Diameter.  This token is also 4mm thick and is white with blue lettering in a hexagon shape, being quite rare.  This token was issued at Chinese run gambling houses, used often in the game of Fantan.  They also became quite common for bartering, even though they were pretty much outlawed as currency, but remained in the underground system.  Thanks for looking!!