Sierra Leone 1968 - EPSG:4175

WKT

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]]

WKT2

GEOGCRS["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], 
	ID["EPSG", "4175"]]

Data from @esri/proj-codes

{
  "wkid": 4175,
  "latestWkid": 4175,
  "macro": "PE_GCS_SIERRA_LEONE_1968",
  "name": "GCS_Sierra_Leone_1968",
  "wkt": "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]]",
  "wkt2": "GEOGCRS[\"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],ID[\"EPSG\",\"4175\"]]",
  "description": "Sierra Leone 1968",
  "authority": "EPSG",
  "version": "6.5(8.1.2)",
  "deprecated": "no",
  "areaname": "Sierra Leone - onshore",
  "extent": {
    "slat": 6.88,
    "nlat": 10,
    "llon": -13.35,
    "rlon": -10.26
  }
}