51900 is a postalcode and its consensus geometry is derived from figov.
{"mz:is_ceased":0,"geom:latitude":61.906929,"figov:nimi":"Juva Keskus","wof:name":"51900","counts:names_total":0,"wof:placetype":"postalcode","wof:hierarchy":[{"continent_id":102191581,"country_id":85633143,"macroregion_id":404227407,"postalcode_id":421476249,"region_id":85683109}],"mz:is_deprecated":0,"lbl:latitude":61.922481,"geom:area":0.080194,"geom:longitude":27.811303,"wof:id":421476249,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1469577646,"wof:belongsto":[102191581,85633143,85683109,404227407],"wof:concordances":{"gp:id":"12829612"},"wof:repo":"whosonfirst-data-postalcode-fi","src:geom":"figov","wof:country":"FI","counts:names_preferred":0,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"FI","counts:names_languages":0,"geom:bbox":"27.4606390722,61.7629546074,28.1536455661,62.0177768073","src:lbl:centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":27.869017,"wof:geomhash":"91d82ff9537c9e57bec5cd78789315c0","wof:parent_id":85683109,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}