GR96(1996) - ESRI:115949

WKT

VERTCS["GR96(1996)", 
	DATUM["Greenland_Reference_1996_(1996)", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["GR96(1996)", 
	DATUM["Greenland_Reference_1996_(1996)", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101], 
		ANCHOREPOCH[1996.62]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115949"]]

Data from @esri/proj-codes

{
  "wkid": 115949,
  "latestWkid": 115949,
  "macro": "PE_VCS_GR96_1996",
  "name": "GR96(1996)",
  "wkt": "VERTCS[\"GR96(1996)\",DATUM[\"Greenland_Reference_1996_(1996)\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"GR96(1996)\",DATUM[\"Greenland_Reference_1996_(1996)\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101],ANCHOREPOCH[1996.62]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115949\"]]",
  "description": "GR96(1996)",
  "authority": "Esri",
  "version": "13.6.0",
  "deprecated": "no",
  "areaname": "Greenland",
  "extent": {
    "slat": 56.38,
    "nlat": 87.02,
    "llon": -75,
    "rlon": 7.99
  }
}