tokul
If you are Dutch, maybe find copy of Jan C. Van Der Wis, Tom Passon - Catalogus van de Nederlandse munten and check if they list more details or variations/error dates.
Or look for that coin in Dutch museum collections.
I'll try to see what i can do, though im not dutch so buying and paying shipping for a book for that only purpose seems like a waste of money (especially for a 1,5€ coin). So maybe i can get in contact with someone who owns that book.
I tried earlier to find documentation about that year in other online catalogues but sadly didn't find anything.
A Museum tour would be cool, but i live in southern Germany, so not something i can just do on a day trip.
But i'll try to contact them, maybe that helps.
Thanks :)