CH1 is a postalregion and its consensus geometry is derived from nsul.
{"mz:is_ceased":0,"wof:created":1690141020,"geom:latitude":53.223851190162684,"wof:name":"CH1","counts:names_total":0,"wof:placetype":"postalregion","wof:hierarchy":[{"continent_id":102191581,"country_id":85633159,"empire_id":136253055,"postalregion_id":1864206239}],"mz:is_deprecated":0,"geom:area":0.0060046379116136415,"geom:longitude":-2.94212563716875,"wof:id":1864206239,"geom:type":"MultiPolygon","wof:lastmodified":1709310334,"wof:belongsto":[102191581,85633159,136253055],"wof:repo":"whosonfirst-data-admin-gb","src:geom":"nsul","wof:country":"GB","counts:names_preferred":0,"counts:names_variant":0,"edtf:inception":"","counts:names_languages":0,"geom:bbox":"-3.013243,53.183658,-2.875750,53.271440","wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"1d811092e2f6972dae35eaa4dc02e51b","wof:parent_id":-1,"wof:placetype_names":["postalregion"],"wof:placetype_id":1897483759,"edtf:cessation":""}