Well Known Text
 
WKT Version 2
PROJCRS["CI1971 / Chatham Islands Map Grid",BASEGEOGCRS["Chatham Islands 1971",DATUM["Chatham Islands Datum 1971",ELLIPSOID["International 1924",6378388,297,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7022]],ID["EPSG",6672]],ID["EPSG",4672]],CONVERSION["Chatham Islands Map Grid",METHOD["Transverse Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural origin",-44,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",-176.5,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",1,SCALEUNIT["unity",1,ID["EPSG",9201]],ID["EPSG",8805]],PARAMETER["False easting",350000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8806]],PARAMETER["False northing",650000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8807]],ID["EPSG",5517]],CS[Cartesian,2,ID["EPSG",4500]],AXIS["Northing (N)",north],AXIS["Easting (E)",east],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5518]]