Any Ideas What This Coin Might Be?

North Borneo had a 2 1/2 cent coin but this is probably some thing like this:
https://www.jakesmp.com/1933-Dr-Wes...p_20719.html

As Pertinax has said it is a gaming machine token. You don't show the other side but it will be for 6D with the company name on it. The fact it has both the pre- and post- decimal values on it would suggest it was issued late 1960s to early 1970s.



Sometime after decimalisation the Decimal Currency bit was dropped and replaced by the company name on both sides.



Eventually the pre-decimal denomination was dropped altogether.