Cagliari 1956 height - EPSG:9722

WKT

VERTCS["Cagliari_1956_height", 
	VDATUM["Cagliari_1956"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Cagliari_1956_height", 
	VDATUM["Cagliari_1956"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "9722"]]

Data from @esri/proj-codes

{
  "wkid": 9722,
  "latestWkid": 9722,
  "macro": "PE_VCS_CAGLIARI_1956_HEIGHT",
  "name": "Cagliari_1956_height",
  "wkt": "VERTCS[\"Cagliari_1956_height\",VDATUM[\"Cagliari_1956\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Cagliari_1956_height\",VDATUM[\"Cagliari_1956\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"9722\"]]",
  "description": "Cagliari 1956 height",
  "authority": "EPSG",
  "version": "10.021(12.9.0)",
  "deprecated": "no",
  "areaname": "Italy - Sardinia onshore",
  "extent": {
    "slat": 38.82,
    "nlat": 41.31,
    "llon": 8.08,
    "rlon": 9.89
  }
}