Hjorsey 1955 - ESRI:37204

WKT

GEOGCS["GCS_Hjorsey_1955", 
	DATUM["D_Hjorsey_1955", 
		SPHEROID["International_1924", 6378388.0, 297.0]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Hjorsey_1955", 
	DATUM["D_Hjorsey_1955", 
		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["Esri", "4658"]]

Data from @esri/proj-codes

{
  "wkid": 37204,
  "latestWkid": 4658,
  "macro": "PE_GCS_HJORSEY_1955",
  "name": "GCS_Hjorsey_1955",
  "wkt": "GEOGCS[\"GCS_Hjorsey_1955\",DATUM[\"D_Hjorsey_1955\",SPHEROID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Hjorsey_1955\",DATUM[\"D_Hjorsey_1955\",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[\"Esri\",\"4658\"]]",
  "description": "Hjorsey 1955",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "codechange",
  "areaname": "Iceland - mainland",
  "extent": {
    "slat": 63.34,
    "nlat": 66.59,
    "llon": -24.66,
    "rlon": -13.38
  }
}