Helle 1954 Jan Mayen Grid - EPSG:3058

WKT

PROJCS["Helle_1954_Jan_Mayen_Grid", 
	GEOGCS["GCS_Helle_1954", 
		DATUM["D_Helle_1954", 
			SPHEROID["International_1924", 6378388.0, 297.0]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 50000.0], 
	PARAMETER["False_Northing", -7800000.0], 
	PARAMETER["Central_Meridian", -8.5], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Helle_1954_Jan_Mayen_Grid", 
	BASEGEOGCRS["GCS_Helle_1954", 
		DATUM["D_Helle_1954", 
			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]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 50000.0], 
		PARAMETER["False_Northing", -7800000.0], 
		PARAMETER["Central_Meridian", -8.5], 
		PARAMETER["Scale_Factor", 1.0], 
		PARAMETER["Latitude_Of_Origin", 0.0]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "3058"]]

Data from @esri/proj-codes

{
  "wkid": 3058,
  "latestWkid": 3058,
  "gcsWkid": 4660,
  "macro": "PE_PCS_HELLE_1954_JAN_MAYEN_GRID",
  "name": "Helle_1954_Jan_Mayen_Grid",
  "wkt": "PROJCS[\"Helle_1954_Jan_Mayen_Grid\",GEOGCS[\"GCS_Helle_1954\",DATUM[\"D_Helle_1954\",SPHEROID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",50000.0],PARAMETER[\"False_Northing\",-7800000.0],PARAMETER[\"Central_Meridian\",-8.5],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Helle_1954_Jan_Mayen_Grid\",BASEGEOGCRS[\"GCS_Helle_1954\",DATUM[\"D_Helle_1954\",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]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",50000.0],PARAMETER[\"False_Northing\",-7800000.0],PARAMETER[\"Central_Meridian\",-8.5],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",0.0]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"3058\"]]",
  "description": "Helle 1954 Jan Mayen Grid",
  "authority": "EPSG",
  "version": "6.4(9.0.0)",
  "deprecated": "no",
  "areaname": "Jan Mayen - onshore",
  "extent": {
    "slat": 70.75,
    "nlat": 71.24,
    "llon": -9.17,
    "rlon": -7.87
  }
}