NZGD 1949 Observation Point Circuit - EPSG:27230

WKT

PROJCS["NZGD_1949_Observation_Point_Circuit", 
	GEOGCS["GCS_New_Zealand_1949", 
		DATUM["D_New_Zealand_1949", 
			SPHEROID["International_1924", 6378388.0, 297.0]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 300000.0], 
	PARAMETER["False_Northing", 700000.0], 
	PARAMETER["Central_Meridian", 170.6285951666667], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", -45.81619661111111], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["NZGD_1949_Observation_Point_Circuit", 
	BASEGEOGCRS["GCS_New_Zealand_1949", 
		DATUM["D_New_Zealand_1949", 
			ELLIPSOID["International_1924", 6378388.0, 297.0]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 300000.0], 
		PARAMETER["False_Northing", 700000.0], 
		PARAMETER["Central_Meridian", 170.6285951666667], 
		PARAMETER["Scale_Factor", 1.0], 
		PARAMETER["Latitude_Of_Origin", -45.81619661111111]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "27230"]]

Data from @esri/proj-codes

{
  "wkid": 27230,
  "latestWkid": 27230,
  "gcsWkid": 4272,
  "macro": "PE_PCS_NZGD_1949_OBSERVATION_PT_CIRCUIT",
  "name": "NZGD_1949_Observation_Point_Circuit",
  "wkt": "PROJCS[\"NZGD_1949_Observation_Point_Circuit\",GEOGCS[\"GCS_New_Zealand_1949\",DATUM[\"D_New_Zealand_1949\",SPHEROID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",300000.0],PARAMETER[\"False_Northing\",700000.0],PARAMETER[\"Central_Meridian\",170.6285951666667],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",-45.81619661111111],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"NZGD_1949_Observation_Point_Circuit\",BASEGEOGCRS[\"GCS_New_Zealand_1949\",DATUM[\"D_New_Zealand_1949\",ELLIPSOID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",300000.0],PARAMETER[\"False_Northing\",700000.0],PARAMETER[\"Central_Meridian\",170.6285951666667],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",-45.81619661111111]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"27230\"]]",
  "description": "NZGD 1949 Observation Point Circuit",
  "authority": "EPSG",
  "version": "6.15(8.1.2)",
  "deprecated": "no",
  "areaname": "New Zealand - South Island - Observation Point mc",
  "extent": {
    "slat": -45.82,
    "nlat": -44.61,
    "llon": 169.77,
    "rlon": 171.24
  }
}