AGD 1966 ACT Standard Grid - EPSG:5825

WKT

PROJCS["AGD_1966_ACT_Standard_Grid", 
	GEOGCS["GCS_Australian_1966", 
		DATUM["D_Australian_1966", 
			SPHEROID["Australian", 6378160.0, 298.25]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 200000.0], 
	PARAMETER["False_Northing", 600000.0], 
	PARAMETER["Central_Meridian", 149.0092948305555], 
	PARAMETER["Scale_Factor", 1.000086], 
	PARAMETER["Latitude_Of_Origin", -35.31773627777778], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["AGD_1966_ACT_Standard_Grid", 
	BASEGEOGCRS["GCS_Australian_1966", 
		DATUM["D_Australian_1966", 
			ELLIPSOID["Australian", 6378160.0, 298.25]], 
		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", 200000.0], 
		PARAMETER["False_Northing", 600000.0], 
		PARAMETER["Central_Meridian", 149.0092948305555], 
		PARAMETER["Scale_Factor", 1.000086], 
		PARAMETER["Latitude_Of_Origin", -35.31773627777778]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "5825"]]

Data from @esri/proj-codes

{
  "wkid": 5825,
  "latestWkid": 5825,
  "gcsWkid": 4202,
  "macro": "PE_PCS_AGD_1966_ACT_STD_GRID",
  "name": "AGD_1966_ACT_Standard_Grid",
  "wkt": "PROJCS[\"AGD_1966_ACT_Standard_Grid\",GEOGCS[\"GCS_Australian_1966\",DATUM[\"D_Australian_1966\",SPHEROID[\"Australian\",6378160.0,298.25]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",200000.0],PARAMETER[\"False_Northing\",600000.0],PARAMETER[\"Central_Meridian\",149.0092948305555],PARAMETER[\"Scale_Factor\",1.000086],PARAMETER[\"Latitude_Of_Origin\",-35.31773627777778],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"AGD_1966_ACT_Standard_Grid\",BASEGEOGCRS[\"GCS_Australian_1966\",DATUM[\"D_Australian_1966\",ELLIPSOID[\"Australian\",6378160.0,298.25]],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\",200000.0],PARAMETER[\"False_Northing\",600000.0],PARAMETER[\"Central_Meridian\",149.0092948305555],PARAMETER[\"Scale_Factor\",1.000086],PARAMETER[\"Latitude_Of_Origin\",-35.31773627777778]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"5825\"]]",
  "description": "AGD 1966 ACT Standard Grid",
  "authority": "EPSG",
  "version": "7.9.5(10.1.1)",
  "deprecated": "no",
  "areaname": "Australia - Australian Capital Territory",
  "extent": {
    "slat": -35.93,
    "nlat": -35.12,
    "llon": 148.76,
    "rlon": 149.4
  }
}