Ah I love a Dutch barge, does yours have functioning leeboards? Very surprised you didn't need a postcode for the address on the birth certificate - although I suppose if it's 'place of birth', it could be anywhere really and that place might not have a postcode.
No leeboards I'm afraid - mine is a replica Luxemotor built in 2011. I have a friend with leeboards and they are beautiful but without sails they are just ornamental and one more thing to sand and varnish!