Johnston Island 1961 - EPSG:4725

WKT

GEOGCS["GCS_Johnston_Island_1961", 
	DATUM["D_Johnston_Island_1961", 
		SPHEROID["International_1924", 6378388.0, 297.0]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Johnston_Island_1961", 
	DATUM["D_Johnston_Island_1961", 
		ELLIPSOID["International_1924", 6378388.0, 297.0]], 
	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", "4725"]]

Data from @esri/proj-codes

{
  "wkid": 4725,
  "latestWkid": 4725,
  "macro": "PE_GCS_JOHNSTON_ISLAND_1961",
  "name": "GCS_Johnston_Island_1961",
  "wkt": "GEOGCS[\"GCS_Johnston_Island_1961\",DATUM[\"D_Johnston_Island_1961\",SPHEROID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Johnston_Island_1961\",DATUM[\"D_Johnston_Island_1961\",ELLIPSOID[\"International_1924\",6378388.0,297.0]],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\",\"4725\"]]",
  "description": "Johnston Island 1961",
  "authority": "EPSG",
  "version": "6.9(9.2.0)",
  "deprecated": "no",
  "areaname": "Johnston Island",
  "extent": {
    "slat": 16.67,
    "nlat": 16.79,
    "llon": -169.59,
    "rlon": -169.47
  }
}