St. Lucia 1955 - EPSG:4606

WKT

GEOGCS["GCS_St_Lucia_1955", 
	DATUM["D_St_Lucia_1955", 
		SPHEROID["Clarke_1880_RGS", 6378249.145, 293.465]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_St_Lucia_1955", 
	DATUM["D_St_Lucia_1955", 
		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", "4606"]]

Data from @esri/proj-codes

{
  "wkid": 4606,
  "latestWkid": 4606,
  "macro": "PE_GCS_ST_LUCIA_1955",
  "name": "GCS_St_Lucia_1955",
  "wkt": "GEOGCS[\"GCS_St_Lucia_1955\",DATUM[\"D_St_Lucia_1955\",SPHEROID[\"Clarke_1880_RGS\",6378249.145,293.465]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_St_Lucia_1955\",DATUM[\"D_St_Lucia_1955\",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\",\"4606\"]]",
  "description": "St. Lucia 1955",
  "authority": "EPSG",
  "version": "6.5(8.0.1)",
  "deprecated": "no",
  "areaname": "St Lucia - onshore",
  "extent": {
    "slat": 13.66,
    "nlat": 14.16,
    "llon": -61.13,
    "rlon": -60.82
  }
}