3121AW is a postalcode and its consensus geometry is derived from oa.
{"mz:is_ceased":0,"wof:created":1469676475,"geom:latitude":51.931204,"wof:name":"3121AW","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":-1,"mz:is_approximate":1,"wof:hierarchy":[{"continent_id":102191581,"country_id":85633337,"locality_id":101751845,"postalcode_id":890832521,"region_id":85687041},{"continent_id":102191581,"country_id":85633337,"localadmin_id":404474273,"locality_id":101751851,"postalcode_id":890832521,"region_id":85687041}],"mz:is_deprecated":0,"geom:area":0,"geom:longitude":4.376647,"wof:id":890832521,"geom:type":"Polygon","wof:lastmodified":1513578846,"clustr:alpha":0.05,"wof:belongsto":[102191581,101751845,85633337,85687041,404474273,101751851],"mz:is_clustr":1,"wof:repo":"whosonfirst-data-postalcode-nl","src:geom":"oa","wof:country":"NL","counts:names_preferred":0,"geom:area_square_m":534.372944,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"NL","counts:names_languages":0,"geom:bbox":"4.37634992599,51.9311141968,4.37690925598,51.9312934875","clustr:count":10,"clustr:area":56.97,"clustr:density":0.18,"wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"26eefe3821a9feb0570eb77af59cb4d9","wof:parent_id":-1,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"clustr:perimeter":0.07,"edtf:cessation":"uuuu"}