IGC 1962 Congo TM Zone 16 - EPSG:3320

WKT

PROJCS["IGC_1962_Congo_TM_Zone_16", 
	GEOGCS["GCS_IGC_1962_6th_Parallel_South", 
		DATUM["D_IGC_1962_Arc_of_the_6th_Parallel_South", 
			SPHEROID["Clarke_1880_RGS", 6378249.145, 293.465]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 500000.0], 
	PARAMETER["False_Northing", 10000000.0], 
	PARAMETER["Central_Meridian", 16.0], 
	PARAMETER["Scale_Factor", 0.9999], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["IGC_1962_Congo_TM_Zone_16", 
	BASEGEOGCRS["GCS_IGC_1962_6th_Parallel_South", 
		DATUM["D_IGC_1962_Arc_of_the_6th_Parallel_South", 
			ELLIPSOID["Clarke_1880_RGS", 6378249.145, 293.465]], 
		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", 500000.0], 
		PARAMETER["False_Northing", 10000000.0], 
		PARAMETER["Central_Meridian", 16.0], 
		PARAMETER["Scale_Factor", 0.9999], 
		PARAMETER["Latitude_Of_Origin", 0.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "3320"]]

Data from @esri/proj-codes

{
  "wkid": 3320,
  "latestWkid": 3320,
  "gcsWkid": 4697,
  "macro": "PE_PCS_IGC_1962_CONGO_TM_16",
  "name": "IGC_1962_Congo_TM_Zone_16",
  "wkt": "PROJCS[\"IGC_1962_Congo_TM_Zone_16\",GEOGCS[\"GCS_IGC_1962_6th_Parallel_South\",DATUM[\"D_IGC_1962_Arc_of_the_6th_Parallel_South\",SPHEROID[\"Clarke_1880_RGS\",6378249.145,293.465]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",10000000.0],PARAMETER[\"Central_Meridian\",16.0],PARAMETER[\"Scale_Factor\",0.9999],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"IGC_1962_Congo_TM_Zone_16\",BASEGEOGCRS[\"GCS_IGC_1962_6th_Parallel_South\",DATUM[\"D_IGC_1962_Arc_of_the_6th_Parallel_South\",ELLIPSOID[\"Clarke_1880_RGS\",6378249.145,293.465]],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\",500000.0],PARAMETER[\"False_Northing\",10000000.0],PARAMETER[\"Central_Meridian\",16.0],PARAMETER[\"Scale_Factor\",0.9999],PARAMETER[\"Latitude_Of_Origin\",0.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"3320\"]]",
  "description": "IGC 1962 Congo TM Zone 16",
  "authority": "EPSG",
  "version": "6.8(9.2.0)",
  "deprecated": "no",
  "areaname": "Congo DR (Zaire) - 6th parallel south 15~E to 17~E",
  "extent": {
    "slat": -5.87,
    "nlat": -3.29,
    "llon": 15,
    "rlon": 17
  }
}