NSC stands for "Nationale Stichting tot exploitatie van Casinospelen in Nederland" which means the National Foundation for the operations of casino games in the Netherlands.
This was the original and official name under which NSC was registered.
Because the name was far to difficult for commercial use, let alone for non Dutch people, the commercial name became Holland Casinos.
A number of years later this was changed again to Holland Casino, without the s at the end.
Each individual casino (12 in total) got the name of the city added, like Holland Casino Amsterdam and Holland Casino Rotterdam.
These jetons were used for training the first dealers in French Roulette and Black Jack. I was one of them in 1976.
In the first few years Black Jack was also dealt with French jetons.