According to my book, after 1957 they always used the word 'royal' on their label, or a crown. I suspect this is the label that was used from 1953 to 1957, which should have that particular shape, but without the crown or the word royal.
Ivo or someone else with more Dutch collecting experience, please correct me if I'm wrong here, since I'm not working from personal experience but only from the reference guide.
Astrid