Netherlands: Weight

c.1810: 

c. 1810: 1 Gramme = 20.807 Holland Assen; 1 Ozt. = 647.1626 Holl. Assen.

Citation: Kelly's The Universal Cambist, Vol.1 (1811)  
 


c. 1810: 1 Gramme = 20.72538 Holland Assen; 1 Ozt. = 647.1626 Holl. Assen.
 




On the English Troy Weight (which did not change):

c. 1830: 1 Gramme = 20.804 Holland Assen; 1 English Ounce Troy = 647.0774 Holl. Assen.
c. 1830: 1 Gramme = 20.8059 Holl. Assen; 1 Ozt. = 647.0774 Holl. Assen.