L.C. 5 Astro 1961 - ESRI:37243

WKT

GEOGCS["GCS_LC5_1961", 
	DATUM["D_LC5_1961", 
		SPHEROID["Clarke_1866", 6378206.4, 294.9786982]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_LC5_1961", 
	DATUM["D_LC5_1961", 
		ELLIPSOID["Clarke_1866", 6378206.4, 294.9786982]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Longitude (lon)", east, 
		ORDER[1]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "37243"]]

Data from @esri/proj-codes

{
  "wkid": 37243,
  "latestWkid": 37243,
  "macro": "PE_GCS_LC5_1961",
  "name": "GCS_LC5_1961",
  "wkt": "GEOGCS[\"GCS_LC5_1961\",DATUM[\"D_LC5_1961\",SPHEROID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_LC5_1961\",DATUM[\"D_LC5_1961\",ELLIPSOID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"37243\"]]",
  "description": "L.C. 5 Astro 1961",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "no",
  "areaname": "Cayman Islands - Little Cayman and Cayman Brac",
  "extent": {
    "slat": 19.63,
    "nlat": 19.78,
    "llon": -80.14,
    "rlon": -79.69
  }
}