BES2020 Saba + Saba height - EPSG:10644

WKT

HVCOORDSYS["BES2020_Saba_and_Saba_height", 
	GEOGCS["BES2020_Saba", 
		DATUM["BES2020_Saba", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["Saba_height", 
		VDATUM["Saba_Vertical_Datum"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["BES2020_Saba_and_Saba_height", 
	GEOGCRS["BES2020_Saba", 
		DATUM["BES2020_Saba", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["Saba_height", 
		VDATUM["Saba_Vertical_Datum"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "10644"]]

Data from @esri/proj-codes

{
  "wkid": 10644,
  "latestWkid": 10644,
  "pcsWkid": 0,
  "gcsWkid": 10639,
  "vcsWkid": 10642,
  "macro": "PE_HVC_BES2020_SABA_SABA_HEIGHT",
  "name": "BES2020_Saba_and_Saba_height",
  "wkt": "HVCOORDSYS[\"BES2020_Saba_and_Saba_height\",GEOGCS[\"BES2020_Saba\",DATUM[\"BES2020_Saba\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"Saba_height\",VDATUM[\"Saba_Vertical_Datum\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"BES2020_Saba_and_Saba_height\",GEOGCRS[\"BES2020_Saba\",DATUM[\"BES2020_Saba\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"Saba_height\",VDATUM[\"Saba_Vertical_Datum\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"10644\"]]",
  "description": "BES2020 Saba + Saba height",
  "authority": "EPSG",
  "version": "11.023(13.5.0)",
  "deprecated": "no",
  "areaname": "BES Islands - Saba onshore",
  "extent": {
    "slat": 17.56,
    "nlat": 17.71,
    "llon": -63.31,
    "rlon": -63.16
  }
}