http://www.boordgeld.nl/index.php/ontstaan-van-boordgeld-en-de-gangbare-munten
http://nl.wikipedia.org/wiki/Boordgeld
The first page tells all about this boordgeld. Interesting story! The second page mentions the year of issue 1947 for the SMN coins.
The following page lists years and mintages, but since the coins are undated, I doubt if it is possible to figure out the year of issue. Instead of lines for different years, one 'no-date' line would be more appropriate, with years and mintages in the comments.
http://www.catawiki.nl/catalogus/penningen-medailles/soorten/boordgeld/2062945-boordgeld-10-cent-1947-smn
I hope you understand Dutch, otherwise ask Google to translate.
