RT38 5 gon O - EPSG:3030

WKT

PROJCS["RT38_5_gon_O", 
	GEOGCS["GCS_RT38", 
		DATUM["D_Stockholm_1938", 
			SPHEROID["Bessel_1841", 6377397.155, 299.1528128]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 1500000.0], 
	PARAMETER["False_Northing", 0.0], 
	PARAMETER["Central_Meridian", 22.55827777777778], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["RT38_5_gon_O", 
	BASEGEOGCRS["GCS_RT38", 
		DATUM["D_Stockholm_1938", 
			ELLIPSOID["Bessel_1841", 6377397.155, 299.1528128]], 
		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", 1500000.0], 
		PARAMETER["False_Northing", 0.0], 
		PARAMETER["Central_Meridian", 22.55827777777778], 
		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", "3030"]]

Data from @esri/proj-codes

{
  "wkid": 3030,
  "latestWkid": 3030,
  "gcsWkid": 4308,
  "macro": "PE_PCS_RT38_5_GON_O",
  "name": "RT38_5_gon_O",
  "wkt": "PROJCS[\"RT38_5_gon_O\",GEOGCS[\"GCS_RT38\",DATUM[\"D_Stockholm_1938\",SPHEROID[\"Bessel_1841\",6377397.155,299.1528128]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",1500000.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",22.55827777777778],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"RT38_5_gon_O\",BASEGEOGCRS[\"GCS_RT38\",DATUM[\"D_Stockholm_1938\",ELLIPSOID[\"Bessel_1841\",6377397.155,299.1528128]],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\",1500000.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",22.55827777777778],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\",\"3030\"]]",
  "description": "RT38 5 gon O",
  "authority": "EPSG",
  "version": "6.7(9.0.0)",
  "deprecated": "no",
  "areaname": "Sweden - 5 gon E",
  "extent": {
    "slat": 65.24,
    "nlat": 68.58,
    "llon": 21.34,
    "rlon": 24.17
  }
}