I noticed that there isn't listed under "Years" there isn't anything listed before 1849, but my coin is clearly stamped 1817. Question: Was there any coinage of a Ducat - Willem III before 1849?
He was born in 1817 and became King in '49 so how could there be circulation coins before that.
Either it's some commemorative medal or you read the date wrong.
So yeah picture or it didn't happen