> In return for her money, the water board promised Jorisdochter, her descendants or anyone who owned the bearer bond 2.5 per cent interest in perpetuity.
This is inaccurate; it was 5%:
> According to its original terms, the bond would pay 5% interest in perpetuity, although the interest rate was reduced to 3.5% and then 2.5% during the 18th century. [1]