I work as a team member on Numista, a numismatic website, and I am unsure of what Spanish Netherlands used as currency: was it guilders, francs, reales, or something else?
The Flemish Pound was in use in Flanders and in Zeeland (in the Republic of the Netherlands). But such standard currencies were above all accounting standards: actual payments were made on credit and a wide range of coins would be used for payments in cash.