6721HT is a postalcode and its consensus geometry is derived from oa.
{"mz:is_ceased":0,"wof:created":1469690214,"geom:latitude":51.994738,"wof:name":"6721HT","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":891170161,"region_id":85687043}],"mz:is_deprecated":0,"geom:area":2.0E-6,"geom:longitude":5.677856,"wof:id":891170161,"geom:type":"Polygon","wof:lastmodified":1469690214,"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":"5.67693328857,51.9932785034,5.67875432968,51.9962921143","clustr:count":40,"clustr:area":134.62,"clustr:density":0.3,"wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"5da485bad7dfc393e218b0bafa6b3514","wof:parent_id":101837743,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"clustr:perimeter":0.46,"edtf:cessation":"uuuu"}