Sweden - onshore and offshore - EPSG:7404

WKT

HVCOORDSYS["HVC_RT90_and_RH70_Height", 
	GEOGCS["GCS_RT_1990", 
		DATUM["D_RT_1990", 
			SPHEROID["Bessel_1841", 6377397.155, 299.1528128]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["RH70", 
		VDATUM["Rikets_Hojdsystem_1970"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["HVC_RT90_and_RH70_Height", 
	GEOGCRS["GCS_RT_1990", 
		DATUM["D_RT_1990", 
			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]], 
	VERTCRS["RH70", 
		VDATUM["Rikets_Hojdsystem_1970"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "7404"]]

Data from @esri/proj-codes

{
  "wkid": 7404,
  "latestWkid": 7404,
  "pcsWkid": 0,
  "gcsWkid": 4124,
  "vcsWkid": 5718,
  "macro": "PE_HVC_RT90_AND_RH70_HEIGHT",
  "name": "HVC_RT90_and_RH70_Height",
  "wkt": "HVCOORDSYS[\"HVC_RT90_and_RH70_Height\",GEOGCS[\"GCS_RT_1990\",DATUM[\"D_RT_1990\",SPHEROID[\"Bessel_1841\",6377397.155,299.1528128]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"RH70\",VDATUM[\"Rikets_Hojdsystem_1970\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"HVC_RT90_and_RH70_Height\",GEOGCRS[\"GCS_RT_1990\",DATUM[\"D_RT_1990\",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]],VERTCRS[\"RH70\",VDATUM[\"Rikets_Hojdsystem_1970\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"7404\"]]",
  "description": "Sweden - onshore and offshore",
  "authority": "EPSG",
  "version": "6.15(10.0.0)",
  "deprecated": "no",
  "areaname": "Sweden - onshore",
  "extent": {
    "slat": 55.28,
    "nlat": 69.07,
    "llon": 10.93,
    "rlon": 24.17
  }
}