It did not really work like that in the Netherlands: in Napoleonic times the 'pond' was officially redefined to be 1kg, but that clearly didn't stick, as descri

It did not really work like that in the Netherlands: in Napoleonic times the 'pond' was officially redefined to be 1kg, but that clearly didn't stick, as described above. An 'ons' of 1/16th of a 'pond' (as described in your linked article) was used in pre-metric times, but the official Dutch metric system[0] of 1820 did not allow them. The 'ons' we use informally now is exactly 100g. That's the thing about traditional measures: they are entirely different when you move a few 100km. [0] https://nl.wikipedia.org/wiki/Nederlands_metriek_stelsel https://nl.wikipedia.org/wiki/Nederlands_metriek_stelsel