Hartebeesthoek94 - ESRI:115719

WKT

VERTCS["Hartebeesthoek_1994", 
	DATUM["D_Hartebeesthoek_1994", 
		SPHEROID["WGS_1984", 6378137.0, 298.257223563]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Hartebeesthoek_1994", 
	DATUM["D_Hartebeesthoek_1994", 
		ELLIPSOID["WGS_1984", 6378137.0, 298.257223563]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115719"]]

Data from @esri/proj-codes

{
  "wkid": 115719,
  "latestWkid": 115719,
  "macro": "PE_VCS_HARTEBEESTHOEK94",
  "name": "Hartebeesthoek_1994",
  "wkt": "VERTCS[\"Hartebeesthoek_1994\",DATUM[\"D_Hartebeesthoek_1994\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Hartebeesthoek_1994\",DATUM[\"D_Hartebeesthoek_1994\",ELLIPSOID[\"WGS_1984\",6378137.0,298.257223563]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115719\"]]",
  "description": "Hartebeesthoek94",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "Africa - South Africa, Lesotho and Eswatini.",
  "extent": {
    "slat": -50.32,
    "nlat": -22.13,
    "llon": 13.33,
    "rlon": 42.85
  }
}