MODDERDAM SEK. Search for: Advanced Search Browse Schools Search Schools MODDERDAM SEK. Contact Information Contact The School Phone: 0216947785 More Information MODDERDAM SEK., PUBLIC, SECONDARY SCHOOL, MATHS SCIENCE AND TECHNOLOGY, Latitude, -33.9558801220043, Longitude, 18.5599152038003. BOARDING SCHOOL= FALSE This Ad has been viewed 8 times. Schools contact details.