CGVD 1928 - EPSG:5713

WKT

VERTCS["CGVD_1928", 
	VDATUM["Canadian_Geodetic_Vertical_Datum_of_1928"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["CGVD_1928", 
	VDATUM["Canadian_Geodetic_Vertical_Datum_of_1928"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5713"]]

Data from @esri/proj-codes

{
  "wkid": 5713,
  "latestWkid": 5713,
  "macro": "PE_VCS_CGVD_1928",
  "name": "CGVD_1928",
  "wkt": "VERTCS[\"CGVD_1928\",VDATUM[\"Canadian_Geodetic_Vertical_Datum_of_1928\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"CGVD_1928\",VDATUM[\"Canadian_Geodetic_Vertical_Datum_of_1928\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5713\"]]",
  "description": "CGVD 1928",
  "authority": "EPSG",
  "version": "6.7(9.3.0.0)",
  "deprecated": "no",
  "areaname": "Canada - CGVD28",
  "extent": {
    "slat": 41.67,
    "nlat": 69.81,
    "llon": -141.01,
    "rlon": -52.54
  }
}