In may 1998 we went to a large auction of Dutch Royal commemoratives in the city of Dordrecht.
The auction got a lot of attention in the dutch press, here are some newspaper articles:
(click on photo to enlarge)
This website has been officially recognized as Dutch Digital Heritage by the National Library (Koninklijke Bibliotheek) of the Netherlands since September 30, 2015 and is digitally stored for future researchers.