Estonia 1997 - ESRI:115712

WKT

VERTCS["Estonia_1997", 
	DATUM["D_Estonia_1997", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Estonia_1997", 
	DATUM["D_Estonia_1997", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115712"]]

Data from @esri/proj-codes

{
  "wkid": 115712,
  "latestWkid": 115712,
  "macro": "PE_VCS_ESTONIA_1997",
  "name": "Estonia_1997",
  "wkt": "VERTCS[\"Estonia_1997\",DATUM[\"D_Estonia_1997\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Estonia_1997\",DATUM[\"D_Estonia_1997\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115712\"]]",
  "description": "Estonia 1997",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "Estonia",
  "extent": {
    "slat": 57.52,
    "nlat": 60,
    "llon": 20.37,
    "rlon": 28.2
  }
}