Sentence:  But on this June evening when Bond walked through the 'kitchen' into the salle privée, it was with a sensation of confidence and cheerful anticipation that he changed a million francs into <WSD>plaques</WSD> of fifty mille and took a seat ... 
Meaning of the word marked with <WSD> tags:  A small card representing an amount of money, used for betting in casinos; a sort of gaming chip.