Amsterdam ships armed with 10pdr guns in 1652 and 1653

Apparently, the gun shot weights 5, 10, 15, and 20pdr were non-standard for Dutch ships. I have thought that they were an older standard, as in the few lists that I have dating from prior to 1639, there are many ships carrying at least the 5, 10, and 15pdr guns. At least one ship carried 20pdr guns in 1652 and 1653, although very few. The 5pdr is equivalent to the English saker (5-1/4pdr). I know for sure that the Amsterdam ships Gelderland (ship of Cornelis van Velsen), Overijssel (ship of Jan van Campen), and the Zeelandia (ship of Jacob Huyrluyt and Nicolaes Marrevelt) all carried a large number of 10pdr guns. The Gelderland exploded in the Battle of the Gabbard (the Zeeslag bij Nieuwpoort), so those guns were lost.