Montserrat 1958 - EPSG:4604

WKT

GEOGCS["GCS_Montserrat_1958", 
	DATUM["D_Montserrat_1958", 
		SPHEROID["Clarke_1880_RGS", 6378249.145, 293.465]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Montserrat_1958", 
	DATUM["D_Montserrat_1958", 
		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", "4604"]]

Data from @esri/proj-codes

{
  "wkid": 4604,
  "latestWkid": 4604,
  "macro": "PE_GCS_MONTSERRAT_1958",
  "name": "GCS_Montserrat_1958",
  "wkt": "GEOGCS[\"GCS_Montserrat_1958\",DATUM[\"D_Montserrat_1958\",SPHEROID[\"Clarke_1880_RGS\",6378249.145,293.465]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Montserrat_1958\",DATUM[\"D_Montserrat_1958\",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\",\"4604\"]]",
  "description": "Montserrat 1958",
  "authority": "EPSG",
  "version": "6.5(10.0.0)",
  "deprecated": "no",
  "areaname": "Montserrat - onshore",
  "extent": {
    "slat": 16.62,
    "nlat": 16.87,
    "llon": -62.29,
    "rlon": -62.08
  }
}