JSLD72 height - EPSG:6693

WKT

VERTCS["JSLD72_height", 
	VDATUM["Japanese_Standard_Levelling_Datum_1972"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["JSLD72_height", 
	VDATUM["Japanese_Standard_Levelling_Datum_1972"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "6693"]]

Data from @esri/proj-codes

{
  "wkid": 6693,
  "latestWkid": 6693,
  "macro": "PE_VCS_JSLD72_HT",
  "name": "JSLD72_height",
  "wkt": "VERTCS[\"JSLD72_height\",VDATUM[\"Japanese_Standard_Levelling_Datum_1972\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"JSLD72_height\",VDATUM[\"Japanese_Standard_Levelling_Datum_1972\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"6693\"]]",
  "description": "JSLD72 height",
  "authority": "EPSG",
  "version": "8.4(10.3.1)",
  "deprecated": "no",
  "areaname": "Japan - onshore - Hokkaido",
  "extent": {
    "slat": 41.34,
    "nlat": 45.54,
    "llon": 139.7,
    "rlon": 145.87
  }
}