Belgium 50 centimes 1955

I would like to add the year 1955 to the following Belgium coin :

50 centimes Belgique with km #148.1

The option to add a year has been locked, because is would be complete!

Because the year 1955 doesn't exists for the km#148.1

Try this one :

https://en.numista.com/catalogue/pieces5332.html

Regards !

Thanks M@verick.
I noticed the difference. This difference was not mentioned in Krause 30th edition (2003). I better use my electronic 2009 edition.