Not only the Netherlands has their own association. Under here is a number of them from other countries.
The Number Plate Collectors Club of Australia (NPCC)
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Autokennzeichen-Sammlerclus (AKS)
Associazione Italiana Studio Targhe Automobilistiche (AISTA)
Automobile License Plate Collectors Association (ALPCA)
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Some of our members have their own webpage.
#241 - Bob Eefting (kentekenzeeland)