6721SP is a postalcode and its consensus geometry is derived from oa.
{"mz:is_ceased":0,"wof:created":1469690221,"geom:latitude":51.993442,"wof:name":"6721SP","counts:names_total":0,"wof:placetype":"postalcode","mz:is_approximate":1,"wof:hierarchy":[{"continent_id":102191581,"country_id":85633337,"localadmin_id":404473893,"locality_id":101837743,"postalcode_id":891170371,"region_id":85687043}],"mz:is_deprecated":0,"geom:area":1.0E-6,"geom:longitude":5.674311,"wof:id":891170371,"geom:type":"Polygon","wof:lastmodified":1469690221,"clustr:alpha":0.05,"wof:belongsto":[85687043,102191581,404473893,85633337,101837743],"mz:is_clustr":1,"wof:repo":"whosonfirst-data-postalcode-nl","src:geom":"oa","wof:country":"NL","counts:names_preferred":0,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"NL","counts:names_languages":0,"geom:bbox":"5.67372655869,51.9930381775,5.67499351501,51.9938278198","clustr:count":28,"clustr:area":46.24,"clustr:density":0.61,"wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"bfd70d030457faa3657629b5511fccaf","wof:parent_id":101837743,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"clustr:perimeter":0.23,"edtf:cessation":"uuuu"}