query: SELECT DISTINCT ?item WHERE {
    ?item wdt:P6379 ?collectie.
  #  ?item wdt:P31 wd:Q5.
  #  ?item wdt:P106 wd:Q1028181.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "nl, en". }
    FILTER (NOT EXISTS {
      ?item rdfs:label ?label.
     FILTER regex(?label, "^[\\x{0000}-\\x{024f}]") .
    })
  }