~~~ and since there is no mention as to what they were used for and under TABLE CHIPS, I')) refer you to ChipGuide. Maybe they can answer your question. Otherwise, all I see are ND letons and have nothing to compare them with such as the accurate documentation ChipGuide used in part to mention Portsmouth had four (4) wheels and, later determined the jetons were Roulettes as in the article and on the chart.

ChipGuide images