312-0017 is a postalcode and its consensus geometry is derived from gn.
{"gn:adm1_code":"","gn:adm2_name":"Hitachinakashi","mz:is_ceased":0,"geom:latitude":36.392,"gn:name":"Nagahorichou","wof:name":"312-0017","counts:names_total":0,"wof:placetype":"postalcode","mz:is_approximate":1,"wof:hierarchy":[{"continent_id":"102191569","country_id":"85632429","locality_id":102032089,"postalcode_id":538157301,"region_id":85672801}],"mz:is_deprecated":0,"geom:area":0,"geom:longitude":140.5413,"wof:id":538157301,"counts:concordances_total":1,"geom:type":"Point","wof:lastmodified":1474577235,"wof:belongsto":["102191569",102032089,"85632429",85672801],"gn:accuracy":"","gn:adm1_name":"Ibarakiken","wof:concordances":{"gp:id":"26223628"},"wof:repo":"whosonfirst-data-postalcode-jp","gn:adm3_name":"","src:geom":"gn","wof:country":"JP","counts:names_preferred":0,"gn:adm3_code":"","gp:parent_id":"28403060","wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"JP","counts:names_languages":0,"geom:bbox":"140.5413,36.392,140.5413,36.392","gn:adm2_code":"","wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"16725a6045b94a72f8fef66593759779","wof:parent_id":102032089,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}