Sierra Leone 1968 UTM Zone 28N - EPSG:2161

WKT

PROJCS["Sierra_Leone_1968_UTM_Zone_28N", 
	GEOGCS["GCS_Sierra_Leone_1968", 
		DATUM["D_Sierra_Leone_1968", 
			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", 0.0], 
	PARAMETER["Central_Meridian", -15.0], 
	PARAMETER["Scale_Factor", 0.9996], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Sierra_Leone_1968_UTM_Zone_28N", 
	BASEGEOGCRS["GCS_Sierra_Leone_1968", 
		DATUM["D_Sierra_Leone_1968", 
			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", 0.0], 
		PARAMETER["Central_Meridian", -15.0], 
		PARAMETER["Scale_Factor", 0.9996], 
		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", "2161"]]

Data from @esri/proj-codes

{
  "wkid": 2161,
  "latestWkid": 2161,
  "gcsWkid": 4175,
  "macro": "PE_PCS_SIERRA_LEONE_1968_UTM_28N",
  "name": "Sierra_Leone_1968_UTM_Zone_28N",
  "wkt": "PROJCS[\"Sierra_Leone_1968_UTM_Zone_28N\",GEOGCS[\"GCS_Sierra_Leone_1968\",DATUM[\"D_Sierra_Leone_1968\",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\",0.0],PARAMETER[\"Central_Meridian\",-15.0],PARAMETER[\"Scale_Factor\",0.9996],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Sierra_Leone_1968_UTM_Zone_28N\",BASEGEOGCRS[\"GCS_Sierra_Leone_1968\",DATUM[\"D_Sierra_Leone_1968\",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\",0.0],PARAMETER[\"Central_Meridian\",-15.0],PARAMETER[\"Scale_Factor\",0.9996],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\",\"2161\"]]",
  "description": "Sierra Leone 1968 UTM Zone 28N",
  "authority": "EPSG",
  "version": "5.2(8.1.2)",
  "deprecated": "no",
  "areaname": "Sierra Leone - west of 12~W",
  "extent": {
    "slat": 7.15,
    "nlat": 9.94,
    "llon": -13.35,
    "rlon": -12
  }
}